Update idlelib/help.html to include idle.rst spelling fix (GH-28191)

The idle.rst fix was GH-27903 two weeks ago.
(cherry picked from commit f05ad9202896f21ca9717f5c9f4b933b7f5b6550)

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

Miss Islington (bot) committed 4y ago

af8c78173742094ceee6f8ba53d791c4eaa357f9

Parent: e5f259e

Committed by GitHub <noreply@github.com> on 9/7/2021, 4:26:48 AM