updated TOC

Author: MGoedtel

articles/aks/TOC.yml

@@ -172,6 +172,8 @@
   items:
     - name: Cluster operations
       items:
+        - name: Use Virtical Pod Autoscaler (preview)
+          href: vertical-pod-autoscaler.md
         - name: Scale an AKS cluster
           href: scale-cluster.md
         - name: Stop/Deallocate nodes with Scale-down Mode