Merge pull request #2832 from ziming/patch-2

Fix fetch return type doc block

src/app/Http/Controllers/Operations/FetchOperation.php

@@ -34,7 +34,7 @@ protected function setupFetchOperationRoutes($segment, $routeName, $controller)
      * Gets items from database and returns to selects.
      *
      * @param string|array $arg
-     * @return void
+     * @return \Illuminate\Http\JsonResponse|Illuminate\Database\Eloquent\Collection|Illuminate\Pagination\LengthAwarePaginator
      */
     private function fetch($arg)
     {