Update debian-vm.sh

tweak description

vm/debian-vm.sh

@@ -412,7 +412,7 @@ qm set $VMID \
   -serial0 socket \
   -description "<div align='center'><a href='https://Helper-Scripts.com'><img src='https://raw.githubusercontent.com/tteck/Proxmox/main/misc/images/logo-81x112.png'/></a>
 
-  # Debian 12
+  # Debian 12 VM
 
   <a href='https://ko-fi.com/D1D7EP4GF'><img src='https://img.shields.io/badge/&#x2615;-Buy me a coffee-blue' /></a>
   </div>" >/dev/null