Restore deleted EnumType

Author: u2rafi

Doc/library/enum.rst

@@ -183,6 +183,8 @@ Data Types
    to subclass *EnumType* -- see :ref:`Subclassing EnumType <enumtype-examples>`
    for details.
 
+.. class:: EnumType
+
    ``EnumType`` is responsible for setting the correct :meth:`!__repr__`,
    :meth:`!__str__`, :meth:`!__format__`, and :meth:`!__reduce__` methods on the
    final *enum*, as well as creating the enum members, properly handling