remove __base__ explaination in the datamodel.rst

Author: furkanonder

Doc/reference/datamodel.rst

@@ -982,16 +982,6 @@ Special attributes:
    :attr:`~object.__dict__`
       The dictionary containing the class's namespace.
 
-   :attr:`~class.__base__`
-      ``__base__`` corresponds to the :c:member:`~PyTypeObject.tp_base` in a
-      type object.  At the C level, Python has a single inheritance model
-      that determines the memory layout of instances.  There is a chain
-      involving base classes that contribute to the instance layout.
-      ``__base__`` is the base class that is involved in that chain.
-
-      .. impl-detail::
-         The behavior of the ``__base__`` attribute is dependent on the :term:`CPython` implementation.
-
    :attr:`~class.__bases__`
       A tuple containing the base classes, in the order of
       their occurrence in the base class list.