Issue python#29012: Remove outdated information about __bases__

Patch by Jim Fasarakis-Hilliard.

Author: berkerpeksag

Doc/reference/datamodel.rst

@@ -765,7 +765,7 @@ Custom classes
    Special attributes: :attr:`~definition.__name__` is the class name; :attr:`__module__` is
    the module name in which the class was defined; :attr:`~object.__dict__` is the
    dictionary containing the class's namespace; :attr:`~class.__bases__` is a
-   tuple (possibly empty or a singleton) containing the base classes, in the
+   tuple (possibly a singleton) containing the base classes, in the
    order of their occurrence in the base class list; :attr:`__doc__` is the
    class's documentation string, or ``None`` if undefined.