[3.12] gh-107307: Update the importlib Docs for PEP 684 (gh-107400) (gh-107413)

gh-107307: Update the importlib Docs for PEP 684 (gh-107400)
(cherry picked from commit cf63df88d38ec3e6ebd44ed184312df9f07f9782)

Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>