Fix typo in ReprEnum documentation (GH-101079)

(cherry picked from commit c5660ae)

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

Author: miss-islington

Doc/library/enum.rst

@@ -613,7 +613,7 @@ Data Types
 
 .. class:: ReprEnum
 
-   :class:`!ReprEum` uses the :meth:`repr() <Enum.__repr__>` of :class:`Enum`,
+   :class:`!ReprEnum` uses the :meth:`repr() <Enum.__repr__>` of :class:`Enum`,
    but the :class:`str() <str>` of the mixed-in data type:
 
       * :meth:`!int.__str__` for :class:`IntEnum` and :class:`IntFlag`