[Doc-A-Thon] Removing UbuntuLTS

Removing UbuntuLTS updating with SKU image.

Author: msaenzbosupport

articles/virtual-machine-scale-sets/tutorial-autoscale-cli.md

@@ -39,7 +39,7 @@ Now create a Virtual Machine Scale Set with [az vmss create](/cli/azure/vmss). T
 az vmss create \
   --resource-group myResourceGroup \
   --name myScaleSet \
-  --image UbuntuLTS \
+  --image <SKU image> \
   --orchestration-mode Flexible \
   --instance-count 2 \
   --admin-username azureuser \