Issue #1957042 by Kevin Morse, foopang, xjm, Fabianx, Cottser: Document why a...

Issue #1957042 by Kevin Morse, foopang, xjm, Fabianx, Cottser: Document why a method in CoreBundle is public static

core/lib/Drupal/Core/CoreBundle.php

@@ -86,7 +86,7 @@ protected function registerModuleHandler(ContainerBuilder $container) {
   /**
    * Registers Twig services.
    *
-   * This is used during install so it needs to stay in PHP (and static too).
+   * This method is public and static so that it can be reused in the installer.
    */
   public static function registerTwig(ContainerBuilder $container) {
     $container->register('twig.loader.filesystem', 'Twig_Loader_Filesystem')