Issue #2321605 by sun: Fix comment syntax in example.settings.local.php

sites/example.settings.local.php

@@ -30,7 +30,7 @@
 /**
  * Disable the render cache, by using the Null cache back-end defined by the
  * development.services.yml file above.
- * /
+ */
 $settings['cache']['bins']['render'] = 'cache.backend.null';
 
 /**