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


`Error: /home/runner/work/pandas/pandas/pandas/core/frame.py:2739:EX01:pandas.DataFrame.to_feather:No examples section found` Could you merge in main once more. I merged your earlier PR first