doc: Add new command `show bgp detail-routes`

doc: Add new command `show bgp detail-routes`

```
donatas-pc# show bgp all detail-routes

For address family: IPv4 Unicast
BGP table version is 11, local router ID is 192.168.10.17, vrf id 0
Default local pref 100, local AS 65002
BGP routing table entry for 10.0.2.0/24, version 1
Paths: (1 available, best #1, table default)
  Advertised to non peer-group peers:
  192.168.10.124
  65001
    192.168.10.124 from 192.168.10.124 (200.200.200.202)
      Origin incomplete, metric 0, valid, external, otc 65001, best (First path received)
      Last update: Tue Dec 20 12:11:52 2022
BGP routing table entry for 10.10.100.0/24, version 2
Paths: (1 available, best #1, table default)
  Advertised to non peer-group peers:
  192.168.10.124
  65001
    192.168.10.124 from 192.168.10.124 (200.200.200.202)
      Origin IGP, metric 0, valid, external, otc 65001, best (First path received)
      Last update: Tue Dec 20 12:11:52 2022
BGP routing table entry for 172.16.31.1/32, version 3
Paths: (1 available, best #1, table default)
  Advertised to non peer-group peers:
  192.168.10.124
  65001
    192.168.10.124 from 192.168.10.124 (200.200.200.202)
      Origin incomplete, metric 0, valid, external, otc 65001, best (First path received)
      Last update: Tue Dec 20 12:11:52 2022
```

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>