Change getter PHPDoc return on Collection

Author: mehdibo

src/Util/ClassSourceManipulator.php

@@ -662,7 +662,7 @@ private function addCollectionRelation(BaseCollectionRelation $relation): void
             $collectionTypeHint,
             false,
             // add @return that advertises this as a collection of specific objects
-            [sprintf('@return %s|%s[]', $collectionTypeHint, $typeHint)]
+            [sprintf('@return %s<int, %s>', $collectionTypeHint, $typeHint)]
         );
 
         $argName = Str::pluralCamelCaseToSingular($relation->getPropertyName());