Fixed documentation build warning.

Doc/reference/datamodel.rst

@@ -1569,7 +1569,7 @@ calling the metaclass's :meth:`__prepare__` method which returns an empty
 :class:`collections.OrderedDict`.  That mapping records the methods and
 attributes of *A* as they are defined within the body of the class statement.
 Once those definitions are executed, the ordered dictionary is fully populated
-and the metaclass's :meth:`__new__ ` method gets invoked.  That method builds
+and the metaclass's :meth:`__new__` method gets invoked.  That method builds
 the new type and it saves the ordered dictionary keys in an attribute
 called *members*.