[3.14] Fix the doctest.testmod() docstring (GH-136675) (GH-136690)

__test__ = None is not supported since Python 2.4.
(cherry picked from commit cb59eaefeda5ff44ac0c742bff2b8afc023be313)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Miss Islington (bot) committed 9mo ago

d888f46fba3defa9fa3b39509827768bf3ac01ff

Parent: 3239742

Committed by GitHub <noreply@github.com> on 7/15/2025, 5:07:01 PM