Update mqtt-v3.sh

ct/mqtt-v3.sh

@@ -346,4 +346,7 @@ lxc-attach -n $CTID -- bash -c "$(wget -qLO - https://raw.githubusercontent.com/
 
 IP=$(pct exec $CTID ip a s dev eth0 | sed -n '/inet / s/\// /p' | awk '{print $2}')
 
+pct set $CTID -description "# ${APP} LXC
+### https://github.com/tteck/Proxmox"
+
 msg_ok "Completed Successfully!\n"