Revert "add documentation to load DI helper"

This reverts commit b1c5152.

Author: Khartir

README.md

@@ -69,9 +69,6 @@ parameters:
     # If you're using PHP config files for Symfony 5.3+, you also need this for auto-loading of `Symfony\Config`:
     scanDirectories:
         - var/cache/dev/Symfony/Config
-    # If you're using PHP config files you need this to load the helper functions (i.e. service())
-    scanFiles:
-        - vendor/symfony/dependency-injection/Loader/Configurator/ContainerConfigurator.php
 ```
 
 ## Constant hassers