Add intro note to services.yaml and routes.yaml

Author: nicolas-grekas

symfony/framework-bundle/3.3/config/services.yaml

@@ -1,3 +1,6 @@
+# This file is the entry point to configure your own services.
+# Files in the packages/ subdirectory configure your dependencies.
+
 # Put parameters here that don't need to change on each machine where the app is deployed
 # https://symfony.com/doc/current/best_practices/configuration.html#application-related-configuration
 parameters:

symfony/routing/3.3/config/routes.yaml

@@ -1,3 +1,6 @@
+# This file is the entry point to configure your own HTTP routes.
+# Files in the routes/ subdirectory configure the routes for your dependencies.
+
 #index:
 #    path: /
 #    defaults: { _controller: 'App\Controller\DefaultController::index' }