DOC: clean-up numpydoc patches now numpydoc 0.9 is released
Since numpydoc is released, we can do some cleanup of what was introduced in https://github.com/pandas-dev/pandas/pull/24098

cc @FHaase 
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26785?src=pr&el=h1) Report
> Merging [#26785](https://codecov.io/gh/pandas-dev/pandas/pull/26785?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/ea06f8d1157601b5fdb48598e27b02149828fba0?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/26785/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/26785?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #26785      +/-   ##
==========================================
- Coverage   91.72%   91.72%   -0.01%     
==========================================
  Files         178      178              
  Lines       50779    50779              
==========================================
- Hits        46579    46575       -4     
- Misses       4200     4204       +4
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.31% <ø> (ø)` | :arrow_up: |
| #single | `41.18% <ø> (-0.09%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/26785?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/26785/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `78.94% <0%> (-10.53%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/26785/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `96.88% <0%> (-0.12%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26785?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/26785?src=pr&el=footer). Last update [ea06f8d...ab84356](https://codecov.io/gh/pandas-dev/pandas/pull/26785?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/26785?src=pr&el=h1) Report
> Merging [#26785](https://codecov.io/gh/pandas-dev/pandas/pull/26785?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/ea06f8d1157601b5fdb48598e27b02149828fba0?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/26785/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/26785?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #26785      +/-   ##
==========================================
- Coverage   91.72%   91.72%   -0.01%     
==========================================
  Files         178      178              
  Lines       50779    50779              
==========================================
- Hits        46579    46575       -4     
- Misses       4200     4204       +4
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.31% <ø> (ø)` | :arrow_up: |
| #single | `41.21% <ø> (-0.06%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/26785?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/26785/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `78.94% <0%> (-10.53%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/26785/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `96.88% <0%> (-0.12%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26785?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/26785?src=pr&el=footer). Last update [ea06f8d...96deed4](https://codecov.io/gh/pandas-dev/pandas/pull/26785?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 This also resolves a bunch of the current build warnings! (down from 330 to 204 ;-)) cc @datapythonista this resolves a bunch of warnings that I was (unsuccessfully ..) trying to find the cause for The failure is unrelated (a crash in one of the tests). If it occurs more, something to investigate though.