README: mistake in formulation of firewall rule

[LinuxOnTheDesktop]

I believe that

sudo ufw allow from <your-mobile-device's-LAN-static-ip> to any port <your-config-port>

should be

sudo ufw allow from <your-mobile-device's-LAN-static-ip> to <your-server-device's-LAN-static-ip> port <your-config-port>

If I am wrong about that, then I submit that the firewalling instructions could be clearer.