Fix markup.

Doc/library/operator.rst

@@ -238,8 +238,8 @@ their character equivalents.
 .. function:: length_hint(obj, default=0)
 
    Return an estimated length for the object *o*. First trying to return its
-   actual length, then an estimate using ``__length_hint__``, and finally
-   returning the default value.
+   actual length, then an estimate using :meth:`object.__length_hint__`, and
+   finally returning the default value.
 
    .. versionadded:: 3.4
 

Doc/reference/datamodel.rst

@@ -1807,7 +1807,7 @@ through the container; for mappings, :meth:`__iter__` should be the same as
 
 .. method:: object.__length_hint__(self)
 
-   Called to implement ``operator.length_hint``. Should return an estimated
+   Called to implement :func:`operator.length_hint`. Should return an estimated
    length for the object (which may be greater or less than the actual length).
    The length must be an integer ``>=`` 0. This method is purely an
    optimization and is never required for correctness.