[PLUGINS][Favourite][RepeatNote][DeleteNote][WebMonetization] Make use of 'activitypub_handler' more readable

plugins/DeleteNote/DeleteNote.php

@@ -200,6 +200,7 @@ class DeleteNote extends NoteHandlerPlugin
     {
         if ($type_activity->get('type') !== 'Delete'
             || !($type_object instanceof Note)) {
+            // Don't care about AbstractObject because we only want to delete objects we already have
             return Event::next;
         }