[3.12] Fix idlelib typos (GH-125484) (#125488)

Fix idlelib typos (GH-125484)

Propagate fixes in Doc/library/idle.rst to help.html.
Change 'interruptable' to 'interruptible' in run.py.
The latter was reported by ember91 in PR 125473.
(cherry picked from commit 3fea1d000ef0a74062fd3fe218ad94618b08d9f2)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>