Clarify pygame.rwobject functions are not needed for normal usage

Author: Starbuck5

docs/reST/ref/pygame.rst

@@ -177,6 +177,8 @@ object instead of the module, which can be used to test for availability.
    This function is used in encoding file paths. Keyword arguments are
    supported.
 
+   This function is not needed for normal pygame-ce usage.
+
    .. versionaddedold:: 1.9.2 (primarily for use in unit tests)
 
    .. ## pygame.encode_string ##
@@ -197,6 +199,8 @@ object instead of the module, which can be used to test for availability.
    codec as returned by ``sys.getfilesystemencoding()``. Keyword arguments are
    supported.
 
+   This function is not needed for normal pygame-ce usage.
+
    .. versionaddedold:: 1.9.2 (primarily for use in unit tests)
 
    .. ## pygame.encode_file_path ##