Update 'prep-grid-vm.sh'

prep-grid-vm.sh

@@ -108,4 +108,4 @@ echo ""
 echo "SSH is now on port 34022. Connect with:"
 echo "  ssh -p 34022 <username>@<server-ip>"
 echo ""
-echo "Root login is disabled. Use sudo from a TF user account."
+echo "Root login is disabled. Use sudo from a TF user account."