[3.12] gh-68400: Remove outdated 2.7 comment (GH-129919) (#129938)

(cherry picked from commit d9bf3c1)

Co-authored-by: Stan Ulbrych <[email protected]>

Author: miss-islington

Lib/idlelib/__main__.py

@@ -5,4 +5,3 @@
 """
 import idlelib.pyshell
 idlelib.pyshell.main()
-# This file does not work for 2.7; See issue 24212.