DOC: Modify validate_rst_title_capitalization.py script
Regarding issue #32550.

@datapythonista

Modify script in order to not take into account words with 2 or more capital letters, which should all be proper words.
Sorry, not sure if we understood each other. We're adding all the exceptions to the list, which I think is good enough. I think this will allow cases like all capital letter, which we don't want, unless explicitly in the list. My preference is not to have this, and just have all the exceptions in the list, even if it's long. Ok no problem!