[TOOLS][DOC] Add documentation to functions flagged by doc-check

plugins/RepeatNote/Entity/NoteRepeat.php

@@ -98,6 +98,9 @@ class NoteRepeat extends Entity
         );
     }
 
+    /**
+     * @see Entity->getNotificationTargetIds
+     */
     public function getNotificationTargetIds(array $ids_already_known = [], ?int $sender_id = null, bool $include_additional = true): array
     {
         if (!\array_key_exists('object', $ids_already_known)) {