add missing parameter key in code sample (#4179)
add missing parameter key in code sample (#4179)


greg0ire/SonataAdminBundle,jordisala1991/SonataAdminBundle,greg0ire/SonataAdminBundle,ARTACK/SonataAdminBundle,osavchenko/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,ARTACK/SonataAdminBundle,ejkun/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,jordisala1991/SonataAdminBundle,Armstrong1992/SonataAdminBundle,ARTACK/SonataAdminBundle,OskarStark/SonataAdminBundle,osavchenko/SonataAdminBundle,ejkun/SonataAdminBundle,OskarStark/SonataAdminBundle,OskarStark/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,jordisala1991/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,ejkun/SonataAdminBundle,osavchenko/SonataAdminBundle,Armstrong1992/SonataAdminBundle,osavchenko/SonataAdminBundle,ejkun/SonataAdminBundle,greg0ire/SonataAdminBundle,jordisala1991/SonataAdminBundle,OskarStark/SonataAdminBundle,ejkun/SonataAdminBundle,osavchenko/SonataAdminBundle,sonata-project/SonataAdminBundle,sonata-project/SonataAdminBundle,ARTACK/SonataAdminBundle,greg0ire/SonataAdminBundle