Issue #2483887 by Wim Leers, joshi.rohit100, Fabianx, dawehner: Mark RenderCache as internal

core/lib/Drupal/Core/Render/RenderCache.php

@@ -17,6 +17,8 @@
 /**
  * Wraps the caching logic for the render caching system.
  *
+ * @internal
+ *
  * @todo Refactor this out into a generic service capable of cache redirects,
  *   and let RenderCache use that. https://www.drupal.org/node/2551419
  */

core/lib/Drupal/Core/Render/RenderCacheInterface.php

@@ -10,8 +10,9 @@
 /**
  * Defines an interface for caching rendered render arrays.
  *
- * @see sec_caching
+ * @internal
  *
+ * @see sec_caching
  * @see \Drupal\Core\Render\RendererInterface
  */
 interface RenderCacheInterface {