Using Twig template name syntax in form_theme example

src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php

@@ -54,7 +54,7 @@ class Configuration implements ConfigurationInterface
                 ->arrayNode('form_themes')
                     ->addDefaultChildrenIfNoneSet()
                     ->prototype('scalar')->defaultValue('form_div_layout.html.twig')->end()
-                    ->example(array('MyBundle::form.html.twig'))
+                    ->example(array('@My/form.html.twig'))
                     ->validate()
                         ->ifTrue(function ($v) { return !\in_array('form_div_layout.html.twig', $v); })
                         ->then(function ($v) {