fix typo in yml service config

Author: dbu

bundles/phpcr_odm.rst

@@ -656,7 +656,7 @@ A service to use the generic initializer looks like this:
             class: Doctrine\Bundle\PHPCRBundle\Initializer\GenericInitializer
             arguments:
                 - { "%acme.content_basepath%", "%acme.menu_basepath%" }
-                - { "%acme.cnd%" }
+                - "%acme.cnd%"
             tags:
                 - { name: "doctrine_phpcr.initializer" }