Issue #1944768 by chx: Uncomment execute method on QueryAggregateInterface so...

Issue #1944768 by chx: Uncomment execute method on QueryAggregateInterface so it can be documented properly

core/lib/Drupal/Core/Entity/Query/QueryAggregateInterface.php

@@ -156,6 +156,6 @@ public function sortAggregate($field, $function, $direction = 'ASC', $langcode =
    * $result[2] = array('count_nid' => 4, 'type' => 'story');
    * @endcode
    */
-  // public function execute();
+  public function execute();
 
 }