Updated first code-block:: bash

The command for executing an console command was wrong. The php command was missing. It will help further readers.

Author: Nitaco

cookbook/console/console_command.rst

@@ -59,7 +59,7 @@ This command will now automatically be available to run:
 
 .. code-block:: bash
 
-    $ app/console demo:greet Fabien
+    $ php app/console demo:greet Fabien
 
 Getting Services from the Service Container
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