Acrolinx fix: VMSS not allowed as an abbreviation

Author: denrea

articles/aks/start-stop-cluster.md

@@ -20,7 +20,7 @@ This article assumes you have an existing AKS cluster. If you need an AKS cluste
 
 When using the cluster stop/start feature, the following conditions apply:
 
-- This feature is only supported for Virtual Machine Scale Set (VMSS) backed clusters.
+- This feature is only supported for Virtual Machine Scale Set backed clusters.
 - The cluster state of a stopped AKS cluster is preserved for up to 12 months. If your cluster is stopped for more than 12 months, you can't recover the state. For more information, see the [AKS support policies](support-policies.md).
 - You can only start or delete a stopped AKS cluster. To perform other operations, like scaling or upgrading, you need to start your cluster first.
 - If you provisioned PrivateEndpoints linked to private clusters, they need to be deleted and recreated again when starting a stopped AKS cluster.