Add a note about ConfigFile in the Saving games tutorial

This closes #2879.

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

tutorials/io/saving_games.rst

@@ -12,6 +12,11 @@ Advanced save game systems should allow for additional information about
 an arbitrary number of objects. This will allow the save function to
 scale as the game grows more complex.
 
+.. note::
+
+    If you're looking to save user configuration, you can use the
+    :ref:`class_ConfigFile` class for this purpose.
+
 Identify persistent objects
 ---------------------------