DOC: Fixing EX01 - Added examples
- [x] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).

Towards https://github.com/pandas-dev/pandas/issues/37875

I could not make the html of each method, so I'm not sure if everything looks well.
I'll use `/preview` here. 
/preview Website preview of this PR available at: https://pandas.pydata.org/preview/53982/ Nice! Looks like there's just a merge conflict to resolve