[WCM] Updated tutorial for new routing auto bundle

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes
| Applies to    | master
| Fixed tickets | 

I will also update the RoutingAutoBundle reference  in this PR.
There [are exceptions](https://github.com/symfony-cmf/symfony-cmf-docs/search?q=we) in the docs (quick tour are allowed), but none of them are in the tutorial :)