Fix: default excluded directory for services

Author: nicoweb

service_container.rst

@@ -158,7 +158,7 @@ each time you ask for it.
                 # this creates a service per class whose id is the fully-qualified class name
                 App\:
                     resource: '../src/*'
-                    exclude: '../src/{Entity,Migrations,Tests,Kernel.php}'
+                    exclude: '../src/{DependencyInjection,Entity,Migrations,Tests,Kernel.php}'
 
                 # ...