Issue #2062589 by sergeypavlenko: Remove Unused local variable $key from...

Issue #2062589 by sergeypavlenko: Remove Unused local variable $key from /core/modules/node/lib/Drupal/node/NodeRenderController.php.

core/modules/node/lib/Drupal/node/NodeRenderController.php

@@ -30,7 +30,7 @@ public function buildContent(array $entities, array $displays, $view_mode, $lang
 
     parent::buildContent($entities, $displays, $view_mode, $langcode);
 
-    foreach ($entities as $key => $entity) {
+    foreach ($entities as $entity) {
       $bundle = $entity->bundle();
       $display = $displays[$bundle];