pythongh-118767: Remove bool(NotImplemented) from pending-removal document (pythonGH-139526)

(cherry picked from commit 29616f3)

Co-authored-by: Jost Migenda <[email protected]>

Author: JostMigenda

Doc/deprecations/pending-removal-in-future.rst

@@ -15,7 +15,6 @@ although there is currently no date scheduled for their removal.
 
 * :mod:`builtins`:
 
-  * ``bool(NotImplemented)``.
   * Generators: ``throw(type, exc, tb)`` and ``athrow(type, exc, tb)``
     signature is deprecated: use ``throw(exc)`` and ``athrow(exc)`` instead,
     the single argument signature.