Fix the confusing "User-defined methods" reference in the datamodel (pythonGH-114276)

(cherry picked from commit b04c500)

Co-authored-by: cdzhan <[email protected]>
Co-authored-by: Adam Turner <[email protected]>
Co-authored-by: Sergey B Kirpichev <[email protected]>

Author: 3 people

Doc/reference/datamodel.rst

@@ -1524,7 +1524,7 @@ Class method objects
 A class method object, like a static method object, is a wrapper around another
 object that alters the way in which that object is retrieved from classes and
 class instances. The behaviour of class method objects upon such retrieval is
-described above, under "User-defined methods". Class method objects are created
+described above, under :ref:`"instance methods" <instance-methods>`. Class method objects are created
 by the built-in :func:`classmethod` constructor.