Docs: Update CSV page to improve readability and language

# Documentation

The Python Docs page for the ``csv`` module uses some language that can be improved. For example, this phrase has an unintended negative connotation:
> The so called CSV...

The page is here:
https://docs.python.org/3/library/csv.html

I'll submit a PR with updates from a fork. 

Thanks!




### Linked PRs
* gh-135246