Pull request: Configuration: imp dns.bind_hosts docs

Merge in DNS/adguard-home-wiki from 1401-dns-bind-hosts to master

Squashed commit of the following:

commit 5bc8cc8d3fd4f2a6db45e8d51561c78d058f1613
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Mar 24 14:43:15 2021 +0300

    Configuration: imp dns.bind_hosts docs
Ainar Garipov 2021-03-24 14:53:15 +03:00
parent a24a9a1178
commit 91f92253bb

@ -145,7 +145,34 @@ Settings are stored in [YAML format](https://en.wikipedia.org/wiki/YAML), possib
- `bind_host` (**before v0.106.0**) - IP address on which to serve DNS
queries.
- `bind_hosts` (**after v0.106.0**) - IP addresses on which to serve DNS
queries. The addresses must be on different interfaces.
queries. For each network interface there can only be one IP address of
each IP version. Examples of valid configurations:
```yaml
# Different network interfaces.
'dns':
'bind_hosts':
- '127.0.0.1'
- '192.168.1.1'
```
```yaml
# Same network interface, different IP versions.
'dns':
'bind_hosts':
- '127.0.0.1'
- '::1'
```
If you want your server to accept requests on all interfaces and using
both IP versions, for example if you run a public server, put **one**
item with the unspecified IP of any version:
```yaml
'dns':
'bind_hosts':
- '0.0.0.0'
```
- `port` — DNS server port to listen on.
- `statistics_interval` - time interval for statistics (in days)
- **Protection settings**