darvin_admin:
    menu:
        groups:
            -
                name:     menu
                position: 20
                colors:
                    main:    '#cb9023'
                    sidebar: '#a4ce23'
                icons:
                    main:    bundles/darvinmenu/images/admin/menus_main.png
                    sidebar: bundles/darvinmenu/images/admin/menus_sidebar.png
    sections:
        -
            entity: Darvin\MenuBundle\Entity\Menu\Item
            config: '@DarvinMenuBundle/Resources/config/admin/menu/item.yaml'

darvin_admin:
    menu:
        groups:
            -
                name:     menu
                position: 20
                colors:
                    main:    '#cb9023'
                    sidebar: '#a4ce23'
                icons:
                    main:    bundles/darvinmenu/images/admin/menus_main.png
                    sidebar: bundles/darvinmenu/images/admin/menus_sidebar.png
    sections:
        Darvin\MenuBundle\Entity\Menu\Item:
            config: '@DarvinMenuBundle/Resources/config/admin/menu/item.yaml'

Use admin section config key as entity class.
Use admin section config key as entity class.
