Updated Comparison to Excel documentation with code example of read_excel and to_excel for #38990
- This is my first time contributing - please let me know if any other detail is needed! Essentially I just swapped the order of the "Excel" and "CSV" paragraphs in the data importing section, so that the examples given for to_excel and read_excel would flow from the CSV example without needing repeated code/codeblocks.

Oh, sorry, one other thing: for future commits, make sure to use [these prefixes](https://pandas.pydata.org/docs/dev/development/contributing.html#committing-your-code). I think that can be fixed by whomever merges doing a [squash](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/about-pull-request-merges#squash-and-merge-your-pull-request-commits), so don't worry about changing it (unless you want to — [instructions](https://docs.github.com/en/github/committing-changes-to-your-project/changing-a-commit-message)). Thank you Aidan, Jeff - and thank you Aidan for guiding me on my first ever pandas PR! hopefully more to come! thanks @bsun94 