Early config group documentation

gistfile1.txt

The apply-groups statement can be given at any level of the
configuration hierarchy, listing group names in priority
order. Groups listed in nested apply-groups statements take priority
over groups in outer statements:

        apply-groups [ eight nine ten ];
        protocols {
            apply-groups seven;
            bgp {
                apply-groups [ five six ];
                group some-bgp-group {
                    apply-groups four;
                    neighbor 10.0.0.1 {
                        apply-groups [ one two three ];
                    }
                }
            }
        }