DOC: fix SyntaxError in doc build on Windows
i'm getting this error for most files during doc build on Windows...

```
>>>-------------------------------------------------------------------------
Exception in C:\Users\simon\OneDrive\code\pandas-simonjayhawkins\doc\source\development\contributing.rst at block ending on line None
Specify :okexcept: as an option in the ipython:: block to suppress this message
  File "<ipython-input-1-9cb881b1c9b0>", line 1
    os.chdir('C:\Users\simon\OneDrive\code\pandas-simonjayhawkins\doc')
            ^
SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape

<<<-------------------------------------------------------------------------
```
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26499?src=pr&el=h1) Report
> Merging [#26499](https://codecov.io/gh/pandas-dev/pandas/pull/26499?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/6d2398a58fda68e40f116f199439504558c7774c?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/26499/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/26499?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #26499      +/-   ##
==========================================
- Coverage   91.75%   91.74%   -0.01%     
==========================================
  Files         174      174              
  Lines       50761    50761              
==========================================
- Hits        46575    46571       -4     
- Misses       4186     4190       +4
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.25% <ø> (ø)` | :arrow_up: |
| #single | `41.68% <ø> (-0.12%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/26499?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/26499/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/26499/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.02% <0%> (-0.12%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26499?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/26499?src=pr&el=footer). Last update [6d2398a...6aee868](https://codecov.io/gh/pandas-dev/pandas/pull/26499?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/26499?src=pr&el=h1) Report
> Merging [#26499](https://codecov.io/gh/pandas-dev/pandas/pull/26499?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/6d2398a58fda68e40f116f199439504558c7774c?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/26499/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/26499?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #26499      +/-   ##
==========================================
- Coverage   91.75%   91.74%   -0.01%     
==========================================
  Files         174      174              
  Lines       50761    50761              
==========================================
- Hits        46575    46571       -4     
- Misses       4186     4190       +4
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.25% <ø> (ø)` | :arrow_up: |
| #single | `41.68% <ø> (-0.12%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/26499?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/26499/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/26499/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.02% <0%> (-0.12%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26499?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/26499?src=pr&el=footer). Last update [6d2398a...6aee868](https://codecov.io/gh/pandas-dev/pandas/pull/26499?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Gotta love Windows...I thought we built the docs on Azure as well?  If we don't, might want to consider doing that to protect against issues like these...