pythongh-97850: Suggest TraversableResources as the alternative for…

… `ResourceLoader` (pythonGH-128601)

Suggest TraversableResources as the alternative for ResourceLoader.

Previously, ResourceReader was the suggested alternative, but it
is itself deprecated in favour of TraversableResources.
(cherry picked from commit 256d6d2)

Co-authored-by: Tomas R. <tomas.roun8@gmail.com>

Doc/library/importlib.rst

@@ -380,13 +380,15 @@ ABC hierarchy::
 
 .. class:: ResourceLoader
 
+   *Superseded by TraversableResources*
+
     An abstract base class for a :term:`loader` which implements the optional
     :pep:`302` protocol for loading arbitrary resources from the storage
     back-end.
 
     .. deprecated:: 3.7
        This ABC is deprecated in favour of supporting resource loading
-       through :class:`importlib.resources.abc.ResourceReader`.
+       through :class:`importlib.resources.abc.TraversableResources`.
 
     .. abstractmethod:: get_data(path)