Fix AsyncMock base class in the docs (GH-18008)

diff --git a/Doc/library/unittest.mock.rst b/Doc/library/unittest.mock.rst
index e92f554..8394304 100644
--- a/Doc/library/unittest.mock.rst
+++ b/Doc/library/unittest.mock.rst
@@ -854,7 +854,7 @@
 
 .. class:: AsyncMock(spec=None, side_effect=None, return_value=DEFAULT, wraps=None, name=None, spec_set=None, unsafe=False, **kwargs)
 
-  An asynchronous version of :class:`Mock`. The :class:`AsyncMock` object will
+  An asynchronous version of :class:`MagicMock`. The :class:`AsyncMock` object will
   behave so the object is recognized as an async function, and the result of a
   call is an awaitable.