Doc: fix incorrect reference in isasyncgenfunction docs (GH-144099)

Fix incorrect reference in isasyncgenfunction docs
(cherry picked from commit f3dd0ca)

Co-authored-by: Yongtao Huang <[email protected]>

Author: hyongtao-code

Doc/library/inspect.rst

@@ -524,7 +524,7 @@ attributes (see :ref:`import-mod-attrs` for module attributes):
 
    .. versionchanged:: 3.13
       Functions wrapped in :func:`functools.partialmethod` now return ``True``
-      if the wrapped function is a :term:`coroutine function`.
+      if the wrapped function is a :term:`asynchronous generator` function.
 
 .. function:: isasyncgen(object)