Update service_container.rst

Remyss4rd · web-flow · commit 6a3eb73f707b · 2017-04-24T11:48:42.000+02:00
Terminal command to find out available services is wrong for 2.8. Here is the good one.
diff --git a/service_container.rst b/service_container.rst
@@ -60,7 +60,7 @@ Find out by running:
 
 .. code-block:: terminal
 
-     $ php bin/console debug:container
+     $ php app/console debug:container
 
 This is just a *small* sample of the output:
 
