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 seems that I'm bugging 2 reviewers! But I'm requesting Marco's review because we talked about it... The request for Matthew's review happens automatically now. > The request for Matthew's review happens automatically now.

it's because of the codeowners file that's recently been added, so he gets notified for any PR touching `ci` Thanks @MarcoGorelli 