DOC: update the pickle.py docstring
Update

Checklist for the pandas documentation sprint (ignore this if you are doing
an unrelated PR):

- [x] PR title is "DOC: update the <your-function-or-method> docstring"
- [x] The validation script passes: `scripts/validate_docstrings.py <your-function-or-method>`
- [x] The PEP8 style check passes: `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] The html version looks good: `python doc/make.py --single <your-function-or-method>`
- [x] It has been proofread on language by another sprint participant

Please include the output of the validation script below between the "```" ticks:

```
# paste output of "scripts/validate_docstrings.py <your-function-or-method>" here
# between the "```" (remove this comment, but keep the "```")

```

If the validation script still gives errors, but you think there is a good reason
to deviate in this case (and there are certainly such cases), please state this
explicitly.


Checklist for other PRs (remove this part if you are doing a PR for the pandas documentation sprint):

- [x] closes #xxxx
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

Hello @radovankavicky! Thanks for updating the PR.

 - In the file [`pandas/io/pickle.py`](https://github.com/pandas-dev/pandas/blob/6d0439454d8d11de17e36636e4f17bbeaabdf106/pandas/io/pickle.py), following are the PEP8 issues :

> [Line 32:1](https://github.com/pandas-dev/pandas/blob/6d0439454d8d11de17e36636e4f17bbeaabdf106/pandas/io/pickle.py#L32): [W293](https://duckduckgo.com/?q=pep8%20W293) blank line contains whitespace



##### Comment last updated on March 10, 2018 at 12:23 Hours UTC This is being updated by https://github.com/pandas-dev/pandas/pull/20253 as well, so therefore closing this one. @radovankavicky I hope there was no error in the docstring assignment, in that case sorry!