DOC: Fix flake8 issues in doc/source/reshaping.rst
- [x] closes #24180
- [ ] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24183?src=pr&el=h1) Report
> Merging [#24183](https://codecov.io/gh/pandas-dev/pandas/pull/24183?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/3dbb137f5eaba5f31a2c39862a144f31d6a2f4a4?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/24183/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/24183?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #24183   +/-   ##
=======================================
  Coverage   92.21%   92.21%           
=======================================
  Files         162      162           
  Lines       51723    51723           
=======================================
  Hits        47695    47695           
  Misses       4028     4028
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.61% <ø> (ø)` | :arrow_up: |
| #single | `43.03% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24183?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/24183?src=pr&el=footer). Last update [3dbb137...12a447e](https://codecov.io/gh/pandas-dev/pandas/pull/24183?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/24183?src=pr&el=h1) Report
> Merging [#24183](https://codecov.io/gh/pandas-dev/pandas/pull/24183?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/138a59a9a06c5f0c31bb853113f7dea90b5a556d?src=pr&el=desc) will **decrease** coverage by `<.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/24183/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/24183?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #24183      +/-   ##
==========================================
- Coverage   92.21%   92.21%   -0.01%     
==========================================
  Files         162      162              
  Lines       51723    51723              
==========================================
- Hits        47695    47694       -1     
- Misses       4028     4029       +1
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.61% <ø> (ø)` | :arrow_up: |
| #single | `43.03% <ø> (-0.01%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/24183?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/json/json.py](https://codecov.io/gh/pandas-dev/pandas/pull/24183/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2pzb24vanNvbi5weQ==) | `92.61% <0%> (-0.48%)` | :arrow_down: |
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/24183/diff?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `87.51% <0%> (+0.09%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24183?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/24183?src=pr&el=footer). Last update [138a59a...0c7c9ec](https://codecov.io/gh/pandas-dev/pandas/pull/24183?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 @datapythonista thanks, just rebased... @charlesdong1991 can you delete the `comparison_with_*` from the exclude list? when fixing the conflict they were incorrectly added back oh, @datapythonista sorry, i didn't check very carefully... just recalled that they were in between `HEAD`, should be removed indeed.... sorry, next time will check the conflicts more carefully No worries, usually conflicts are about code added or modified, but when the code is deleted, the fix is usually removing the code block. It usually helps to do a `git diff` after fixing the conflict, so you know what your branch is actually changing with respect to master. can you merge master here thanks! @datapythonista sorry, i was working and didn't notice the email... and many thanks for solving the merge conflict for me...  no worries, these trivial conflicts can be easily fixed in the github UI