BUG fixed broken link re GH16279
GH16279

http://nbviewer.jupyter.org/github/pandas-dev/pandas/blob/master/doc/source/html-styling.ipynb gives 404, changed to
http://nbviewer.ipython.org/github/pandas-dev/pandas/blob/master/doc/source/style.ipynb

 - [ ] closes #16279
 - [ ] tests added / passed
 - [ ] passes ``git diff upstream/master --name-only -- '*.py' | flake8 --diff``
 - [ ] whatsnew entry

@SimonBaron The change is good, but can you make a new PR against the master branch instead of the 0.20.x branch? (when opening the PR, you should be able to change this). @jorisvandenbossche yeah, I'll do that. thanks for the help. :) # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=h1) Report
> Merging [#16280](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=desc) into [0.20.x](https://codecov.io/gh/pandas-dev/pandas/commit/e346c663cf76186c22f4d3b703461b1b60db280f?src=pr&el=desc) will **increase** coverage by `<.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/16280/graphs/tree.svg?src=pr&token=eZ4WkYLtcO&width=650&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           0.20.x   #16280      +/-   ##
==========================================
+ Coverage   90.31%   90.31%   +<.01%     
==========================================
  Files         167      161       -6     
  Lines       50907    50898       -9     
==========================================
- Hits        45977    45969       -8     
+ Misses       4930     4929       -1
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.1% <ø> (+0.01%)` | :arrow_up: |
| #single | `40.29% <ø> (-0.1%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/io/msgpack/\_version.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2lvL21zZ3BhY2svX3ZlcnNpb24ucHk=) | `44.86% <0%> (-55.14%)` | :arrow_down: |
| [pandas/core/util/hashing.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvdXRpbC9oYXNoaW5nLnB5) | `92.03% <0%> (-7.02%)` | :arrow_down: |
| [pandas/core/computation/expressions.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vZXhwcmVzc2lvbnMucHk=) | `90.47% <0%> (-2.21%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.58% <0%> (-0.1%)` | :arrow_down: |
| [pandas/util/hashing.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvaGFzaGluZy5weQ==) | | |
| [pandas/\_\_init\_\_.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL19faW5pdF9fLnB5) | | |
| [pandas/formats/style.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2Zvcm1hdHMvc3R5bGUucHk=) | | |
| [pandas/io/sas/\_\_init\_\_.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2lvL3Nhcy9fX2luaXRfXy5weQ==) | | |
| [pandas/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL3Rlc3RpbmcucHk=) | | |
| ... and [16 more](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=footer). Last update [e346c66...5749ba7](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=h1) Report
> Merging [#16280](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=desc) into [0.20.x](https://codecov.io/gh/pandas-dev/pandas/commit/e346c663cf76186c22f4d3b703461b1b60db280f?src=pr&el=desc) will **increase** coverage by `<.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/16280/graphs/tree.svg?token=eZ4WkYLtcO&width=650&src=pr&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           0.20.x   #16280      +/-   ##
==========================================
+ Coverage   90.31%   90.31%   +<.01%     
==========================================
  Files         167      161       -6     
  Lines       50907    50898       -9     
==========================================
- Hits        45977    45969       -8     
+ Misses       4930     4929       -1
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.1% <ø> (+0.01%)` | :arrow_up: |
| #single | `40.29% <ø> (-0.1%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/io/msgpack/\_version.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2lvL21zZ3BhY2svX3ZlcnNpb24ucHk=) | `44.86% <0%> (-55.14%)` | :arrow_down: |
| [pandas/core/util/hashing.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvdXRpbC9oYXNoaW5nLnB5) | `92.03% <0%> (-7.02%)` | :arrow_down: |
| [pandas/core/computation/expressions.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vZXhwcmVzc2lvbnMucHk=) | `90.47% <0%> (-2.21%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.58% <0%> (-0.1%)` | :arrow_down: |
| [pandas/formats/style.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2Zvcm1hdHMvc3R5bGUucHk=) | | |
| [pandas/\_\_init\_\_.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL19faW5pdF9fLnB5) | | |
| [pandas/io/msgpack/\_\_init\_\_.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2lvL21zZ3BhY2svX19pbml0X18ucHk=) | | |
| [pandas/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL3Rlc3RpbmcucHk=) | | |
| [pandas/io/json/\_\_init\_\_.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2lvL2pzb24vX19pbml0X18ucHk=) | | |
| ... and [16 more](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=footer). Last update [e346c66...5749ba7](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=h1) Report
> Merging [#16280](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=desc) into [0.20.x](https://codecov.io/gh/pandas-dev/pandas/commit/e346c663cf76186c22f4d3b703461b1b60db280f?src=pr&el=desc) will **increase** coverage by `<.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/16280/graphs/tree.svg?src=pr&width=650&token=eZ4WkYLtcO&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           0.20.x   #16280      +/-   ##
==========================================
+ Coverage   90.31%   90.31%   +<.01%     
==========================================
  Files         167      161       -6     
  Lines       50907    50898       -9     
==========================================
- Hits        45977    45969       -8     
+ Misses       4930     4929       -1
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.1% <ø> (+0.01%)` | :arrow_up: |
| #single | `40.29% <ø> (-0.1%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/io/msgpack/\_version.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2lvL21zZ3BhY2svX3ZlcnNpb24ucHk=) | `44.86% <0%> (-55.14%)` | :arrow_down: |
| [pandas/core/util/hashing.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvdXRpbC9oYXNoaW5nLnB5) | `92.03% <0%> (-7.02%)` | :arrow_down: |
| [pandas/core/computation/expressions.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vZXhwcmVzc2lvbnMucHk=) | `90.47% <0%> (-2.21%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.58% <0%> (-0.1%)` | :arrow_down: |
| [pandas/computation/expressions.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2NvbXB1dGF0aW9uL2V4cHJlc3Npb25zLnB5) | | |
| [pandas/json.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2pzb24ucHk=) | | |
| [pandas/io/sas/\_\_init\_\_.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2lvL3Nhcy9fX2luaXRfXy5weQ==) | | |
| [pandas/io/msgpack/\_\_init\_\_.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL2lvL21zZ3BhY2svX19pbml0X18ucHk=) | | |
| [pandas/plotting/\_\_init\_\_.py](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree#diff-cGFuZGFzL3Bsb3R0aW5nL19faW5pdF9fLnB5) | | |
| ... and [16 more](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=footer). Last update [e346c66...5749ba7](https://codecov.io/gh/pandas-dev/pandas/pull/16280?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
