Fix PR08, RT02, RT03, and SA01 on pandas.Index.fillna
- [x] closes #https://github.com/pandanistas/pandanistas_sprint_ui2020/issues/5
- [ ] tests added / passed
- [x] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Why was all of those files in c4099b5 was removed? @RafifEL looks like something went awry with the git workflow here. Can you `git checkout master FILENAME` for all the files you didn't update the docstring in and re-push? > @RafifEL looks like something went awry with the git workflow here. Can you `git checkout master FILENAME` for all the files you didn't update the docstring in and re-push?

I'm sorry, I'm new to this stuff, is there anyway for me to hard reset to 1dbea46 commit? Sure! From your branch try:

```sh
git reset --hard 1dbea46
git push -f origin rafif-feature
``` > Why was all of those files in [c4099b5](https://github.com/pandas-dev/pandas/commit/c4099b526ec0e1add6577f5d07d753860fce9b38) was removed?

I'm Sorry, i was trying to see the HTML of the documentation by using "python doc/make.py html". It got an Error, so i delete the reference folder on this branch to see it. Thanks @RafifEL 