[3.9] Fix typo in unittest.rst: addCleanupModule -> addModuleCleanup (GH-92631) (GH-92661)

(cherry picked from commit 38486ca2)


Co-authored-by: Mikhail Terekhov <termim@gmail.com>

Automerge-Triggered-By: GH:serhiy-storchaka

Doc/library/unittest.rst

@@ -2418,7 +2418,7 @@ To add cleanup code that must be run even in the case of an exception, use
    after :func:`setUpModule` if :func:`setUpModule` raises an exception.
 
    It is responsible for calling all the cleanup functions added by
-   :func:`addCleanupModule`. If you need cleanup functions to be called
+   :func:`addModuleCleanup`. If you need cleanup functions to be called
    *prior* to :func:`tearDownModule` then you can call
    :func:`doModuleCleanups` yourself.