[3.12] gh-107732: Mention dir support in importlib.resources docs (GH-107734) (#109058)

gh-107732: Mention dir support in importlib.resources docs (#107734)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
(cherry picked from commit 9f0c0a46f00d687e921990ee83894b2f4ce8a6e7)

Co-authored-by: Shahriar Heidrich <smheidrich@weltenfunktion.de>