Update webrtc.md (#855)

* Update webrtc.md

Added more troubleshooting options

* Update webrtc.md

Fixed the wording
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@ -66,6 +66,10 @@ You can find it in `/etc/kvmd/janus/janus.jcfg`.
In rare cases, WebRTC may not work. The most common reasons are:
* Clearing the Cache
* Try other browsers - Try incognito or private window (this disableds all extensions)
* Tricky IPv6 configuration on the network. IPv6 support for WebRTC in PiKVM is still in its infancy, so if your network has IPv4, it will be easiest to disable IPv6 on PiKVM. To do this, switch the file system to write mode using `rw` command, add option `ipv6.disable_ipv6=1` to `/boot/cmdline.txt` and perform `reboot`. Also see [here](https://wiki.archlinux.org/title/IPv6#Disable_IPv6).
* A paranoid firewall when you try to connect to the PiKVM by forwarding port 443 to the Internet from the internal network. WebRTC is not enough of this, it uses UDP on ports 10000-20000 for a P2P connection. Make sure that the Firewall does not block them.