Docstring for show_versions in master
- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Connected with issue #33044 and PR #33073. As @MomIsBestFriend mentions https://github.com/pandas-dev/pandas/pull/33073#issuecomment-605607698, you can just update #33073 and merge master into _that_ branch.

Let's continue development in #33073 and address @jreback's comments there 