Removed a todo note that had been completed.

taxonomy_display.module

@@ -159,7 +159,6 @@ function taxonomy_display_taxonomy_display_plugins() {
     // Note: All of the class's files are in our module's .info files array so
     //   that auto loading works.
     'associated' => array(
-      // TODO: Add core, hidden, views
       'TaxonomyDisplayAssociatedDisplayHandlerCore' => t('Core'),
       'TaxonomyDisplayAssociatedDisplayHandlerHidden' => t('Hidden'),
     ),