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

It's not possible to make the html file for each method before opening the PR:
/preview needed. 
Thanks @DeaMariaLeon 