[3.10] Fix typo in unittest.rst: addCleanupModule -> addModuleCleanup (GH-92631) (GH-92660) (cherry picked from commit 38486ca212c0827d54e7b0d0b1e2c1ccc2bdad33) Co-authored-by: Mikhail Terekhov <termim@gmail.com> Automerge-Triggered-By: GH:serhiy-storchaka