Remove tip for creating a new AppBundle

The tip seems to be unnecessary, since the AppBundle is also generated with `symfony new blog 2.3.23` (and 2.5.8). In addition the mentioned `generate:bundle` command does not work in SF 2.3 SE, since it stops with a `The namespace must contain a vendor namespace` error.

Author: xelaris

best_practices/creating-the-project.rst

@@ -150,16 +150,6 @@ that follows these best practices:
        ├─ app.php
        └─ app_dev.php
 
-.. tip::
-
-    If you are using Symfony 2.6 or a newer version, the ``AppBundle`` bundle
-    is already generated for you. If you are using an older Symfony version,
-    you can generate it by hand executing this command:
-
-    .. code-block:: bash
-
-        $ php app/console generate:bundle --namespace=AppBundle --dir=src --format=annotation --no-interaction
-
 Extending the Directory Structure
 ---------------------------------