[3.11] Python documents state elsewhere that a comma is not an operator (GH-98736) (#98757)

Python documents state elsewhere that a comma is not an operator, so calling it an operator here is confusing. See https://docs.python.org/3/reference/lexical_analysis.htmlGH-operators and https://docs.python.org/3/faq/programming.htmlGH-id22.
(cherry picked from commit d578aaea6257458c199328100cbb5af64c6a043e)

Co-authored-by: Gerardwx <Gerardwx@users.noreply.github.com>