DOC: Correct docstring formatting for excel related functions GH23494
- [X] closes #23494 
- [ ] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Addresses failed validations from validate_docstrings.py in pandas.read_excel

First open source pull request! Looking to improve.