actor: Fix deadlinks to renamed manual page in API reference

direct/src/actor/Actor.py

@@ -1,7 +1,7 @@
 """Actor module: contains the Actor class.
 
-See the :ref:`models-and-actors` page in the Programming Guide to learn
-more about loading models and animated actors.
+See the :ref:`loading-actors-and-animations` page in the Programming Guide
+to learn more about loading animated models.
 """
 
 __all__ = ['Actor']

direct/src/actor/__init__.py

@@ -5,6 +5,6 @@ the lower-level :class:`panda3d.core.Character` implementation.
 It loads and controls an animated character and manages the animations
 playing on it.
 
-See the :ref:`models-and-actors` page in the Programming Guide to learn
-more about loading models and animated actors.
+See the :ref:`loading-actors-and-animations` page in the Programming Guide
+to learn more about loading animated models.
 """