Improve document for **kwargs argument of pandas.DataFrame.to_markdown
- [x] closes #34568 
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

Sorry thought Tom implemented the to_markdown but looks like it was @MarcoGorelli - does this look good to you? > Sorry thought Tom implemented the to_markdown but looks like it was @MarcoGorelli

Well, it was me but with the core team holding my hand through the process :)

> does this look good to you?

LGTM, tried building it and the link works as expected Great thanks @nuka137 