DOC: add type BinaryIO to path param #35505
- [ ] closes #35505
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Seems fine.  Not sure if the extra part of the docstring is necessary. thanks @alexhtn (comment on a followon PR)