Update section: "9.4.1.1. Adding DNS Zones from the Web UI" with information about adding DNS reverse zone. There are two ways how to add reverse zone.

For network 192.168.1.0/24:

a) by zone name (1.168.192.in-addr.arpa.):
1. Add a new DNS Zone
2. enter (to first input) 1.168.192.in-addr.arpa.
b) by network address:
1. Add a new DNS Zone
2. select Reverse zone IP network:
3. enter 192.168.1.0/24

note: 'Reverse zone IP network' validator stops screaming when full network address is entered. Don't be discouraged after first char.

Inspired by ticket #2944