[Doc] Better explain how to configure a custom controller
[Doc] Better explain how to configure a custom controller

OskarStark/EasyAdminBundle,OskarStark/EasyAdminBundle,yceruto/EasyAdminBundle,OskarStark/EasyAdminBundle,yceruto/EasyAdminBundle,javiereguiluz/EasyAdminBundle,yceruto/EasyAdminBundle,javiereguiluz/EasyAdminBundle