gh-92611: Add details on replacements for cgi utility funcs (GH-92792) (GH-93967)

Per [suggestions on a Discourse thread](https://discuss.python.org/t/pep-594-take-2-removing-dead-batteries-from-the-standard-library/13508/51), discussed in GH-92611 and as a followup to PR GH-92612 , this PR add additional specific per-function replacement information for the utility functions in the `cgi` module deprecated by PEP 594 (PEP-594).

(cherry picked from commit 71354adff07f8beba8374767532bb9da34546e66)

Co-authored-by: CAM Gerlach <CAM.Gerlach@Gerlach.CAM>