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>
1 file changed