

TITLE
Doc styling utils adds parasites new lines

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## Environment info
     
- `transformers` version: 4.2.0dev0
- Platform: Windows-10-10.0.18362-SP0
- Python version: 3.7.9
- PyTorch version (GPU?): 1.7.1 (False)
- Tensorflow version (GPU?): 2.3.1 (False)
- Using GPU in script?: Nope
- Using distributed or parallel set-up in script?: Nope

### Who can help

@sgugger 

## Information

Running the python util to style docs adds parasite new lines in every single docstring. See:

```bash
$ python utils/style_doc.py src/transformers docs/source --max_len 119 --check_only
Traceback (most recent call last):
  File "utils/style_doc.py", line 491, in <module>
    main(*args.files, max_len=args.max_len, check_only=args.check_only)
  File "utils/style_doc.py", line 479, in main
    raise ValueError(f"{len(changed)} files should be restyled!")
ValueError: 345 files should be restyled!
```

See this commit for an example of what it does: https://github.com/huggingface/transformers/pull/9150/commits/b4dedd5ca25f043c66d12c774fa00a34c74dffb2

## To reproduce

Steps to reproduce the behavior:

1. Checkout and update master branch
2. run `python utils/style_doc.py src/transformers docs/source --max_len 119 --check-only` from transformers root

Output:
```python
Traceback (most recent call last):
  File "utils/style_doc.py", line 491, in <module>
    main(*args.files, max_len=args.max_len, check_only=args.check_only)
  File "utils/style_doc.py", line 479, in main
    raise ValueError(f"{len(changed)} files should be restyled!")
ValueError: 345 files should be restyled!
```

It might have something to do with Windows or a particular setup of my machine because behavior cannot be reproduced by @patrickvonplaten.

## Expected behavior

On master branch, documentation should not need to be restyled
