Remove obselete Mercure turbo/hub configuration

Author: smnandre

src/Turbo/doc/index.rst

@@ -512,7 +512,7 @@ If you use Symfony Flex, the configuration has been generated for you,
 be sure to update the ``MERCURE_URL`` in the ``.env`` file to point to a
 Mercure Hub (it's not necessary if you are using Symfony Docker).
 
-Otherwise, configure Mercure Hub(s) to use:
+Otherwise, configure Mercure Hub(s) as explained in the documentation:
 
 .. code-block:: yaml
 
@@ -790,13 +790,6 @@ the following configuration:
                 url: https://hub2.example.net/.well-known/mercure
                 jwt: snip
 
-.. code-block:: yaml
-
-    # config/packages/turbo.yaml
-    turbo:
-        mercure:
-            hubs: [hub1, hub2]
-
 Use the appropriate Mercure ``HubInterface`` service to send a change
 using a specific transport::