[3.14] gh-143513: Remove importlib.abc documentation for removed ABCs (GH-143605...

[3.14] gh-143513: Remove importlib.abc documentation for removed ABCs (GH-143605) (GH-144166)

gh-143513: Remove importlib.abc documentation for removed ABCs (GH-143605)

In 3.11 ResourceReader, Traversable, & TraversableResources moved from importlib.abc to importlib.resources.abc (commit e712a5b277866a71c195f38c1b5d87d9126dba3e).

In 3.12 old import locations were deprecated (commit 71848c960927af801656026203371c41ad139b5a).

In 3.14 backwards-compat support was removed (commit 0751511d24295c39fdf2f5b2255e3fa3d796ce4d).
(cherry picked from commit f8262b84f5b76e45cfea9d73b09657919926850f)

Co-authored-by: Alex Willmer <alex@moreati.org.uk>
Co-authored-by: Brett Cannon <brett@python.org>