DOC: update the pickle.py docstring

[radovankavicky]

Update

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

• PR title is "DOC: update the docstring"
• The validation script passes: scripts/validate_docstrings.py <your-function-or-method>
• The PEP8 style check passes: git diff upstream/master -u -- "*.py" | flake8 --diff
• The html version looks good: python doc/make.py --single <your-function-or-method>
• 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):

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

[pep8speaks]

Hello @radovankavicky! Thanks for updating the PR.

• In the file pandas/io/pickle.py, following are the PEP8 issues :

Line 32:1: W293 blank line contains whitespace

Comment last updated on March 10, 2018 at 12:23 Hours UTC

[jreback]

extra whitespace

[jreback]

is there a generic link here?

[jorisvandenbossche]

This is being updated by #20253 as well, so therefore closing this one. @radovankavicky I hope there was no error in the docstring assignment, in that case sorry!