[3.10] gh-99795: Fix typo in importlib.resources.abc (GH-99796) (GH-99800)

Changing TraversableReader to TraversableResources at one place of the documentation.

See GH-99795 for more details..
(cherry picked from commit 5f8898216e7b67b7de6b0b1aad9277e88bcebfdb)

Co-authored-by: busywhitespace <busywhitespace@tuta.io>

Co-authored-by: busywhitespace <busywhitespace@tuta.io>