gh-84753: Clarify change made to `inspect` functions (GH-94554) (GH-94560)

(cherry picked from commit a2a3f2c5)

Co-authored-by: Łukasz Langa <lukasz@langa.pl>

Misc/NEWS.d/next/Library/2022-06-21-11-40-31.gh-issue-84753.FW1pxO.rst

-:func:`inspect.iscoroutinefunction` now properly returns ``True`` when an instance
-of :class:`unittest.mock.AsyncMock` is passed to it.  This makes it consistent with
+:func:`inspect.iscoroutinefunction`, :func:`inspect.isgeneratorfunction`,
+and :func:`inspect.isasyncgenfunction` now properly return ``True`` for
+duck-typed function-like objects like instances of
+:class:`unittest.mock.AsyncMock`.
+
+This makes :func:`inspect.iscoroutinefunction` consistent with the
 behavior of :func:`asyncio.iscoroutinefunction`.  Patch by Mehdi ABAAKOUK.