Changes to lines 151, 158, and 172.

Please correct me if I'm wrong, but shouldn't these code changes to added to `src/Acme/HelloBundle/Resources/config/routing.yml` instead of `app/config/routing.yml`?

| Q                    | A
| ----------------- | ---
| Doc fix?          | yes
| New docs?     | yes 
| Applies to       | all 
| Fixed tickets   | N/A