[3.12] datamodel: Fix a typo in object.__init_subclass__ (pythonG…

…H-111599) (python#114004)

datamodel: Fix a typo in ``object.__init_subclass__`` (pythonGH-111599)
(cherry picked from commit a47353d)

Co-authored-by: InSync <[email protected]>

Doc/reference/datamodel.rst

@@ -2303,7 +2303,7 @@ class defining the method.
    this method is implicitly converted to a class method.
 
    Keyword arguments which are given to a new class are passed to
-   the parent's class ``__init_subclass__``. For compatibility with
+   the parent class's ``__init_subclass__``. For compatibility with
    other classes using ``__init_subclass__``, one should take out the
    needed keyword arguments and pass the others over to the base
    class, as in::