Correct return comment.

module/VuFindSearch/src/VuFindSearch/Feature/SimilarInterface.php

@@ -47,7 +47,7 @@ interface SimilarInterface
      * @param string   $id     Id of record to compare with
      * @param ParamBag $params Search backend parameters
      *
-     * @return RecordCollectionInterface
+     * @return \VuFindSearch\Response\RecordCollectionInterface
      */
     public function similar($id, ParamBag $params = null);
 }