Explain the option of manually defining your public IP in the documentation for Coturn

I was very surprised by the fact that a rather important configuration for coturn was "hidden" in the Hosts file, but not mentioned here. 

Therefore my suggestion is to explicitly mention it here, as I believe that is that natural for people to look.
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@ -15,6 +15,13 @@ matrix_coturn_enabled: false
In that case, Synapse would not point to any Coturn servers and audio/video call functionality may fail.
## Manually defining your public IP
In the `hosts` file we explicitly ask for your server's external IP address when defining `ansible_host`, because the same value is used for configuring Coturn.
If you'd rather use a local IP for `ansible_host`, make sure to set up `matrix_coturn_turn_external_ip_address` replacing `YOUR_PUBLIC_IP` with the pubic IP used by the server.
```yaml
matrix_coturn_turn_external_ip_address: "YOUR_PUBLIC_IP"
```
## Using your own external Coturn server