DOC: SS01 docstrings errors fixed
xref #27977
- [ ] closes part of [MarcoGorelli/PyDataGlobal2020-sprint#4](https://github.com/MarcoGorelli/PyDataGlobal2020-sprint/issues/4)
- [ ] tests added / passed
- [X] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry
