BUG: Parameter col_space of to_html method not working with multi-level columns 
BUG: Parameter col_space of to_html method not working with multi-level columns 

- [X] closes #53885
- [x] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [X] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [X] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [x] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

Just needs a whatsnew note in 2.1.0.rst > Just needs a whatsnew note in 2.1.0.rst

done, have updated the whatsnew Thanks @dannyi96 