Fix incorrect UDPxy link

[GrandadEvans]

The link to UDPxy in the configuration.md file is incorrect

[devrimerduman]

the is a issue;
after reboot the lxc on proxmox. the service is not startting. error: no interfaces had joined to group

I fixed like that:
systemctl enable --now threadfin

systemctl edit threadfin
Paste those lines:
[Unit]
After=network-online.target
Wants=network-online.target

[Service]
Restart=always
RestartSec=5

after that:
systemctl daemon-reload
systemctl restart threadfin
systemctl status threadfin