[ACR] TOC fix (AKS auth)

Author: mmacy

articles/container-registry/TOC.yml

@@ -67,7 +67,7 @@
       href: container-registry-auth-service-principal.md
     - name: Azure Container Instances
       href: container-registry-auth-aci.md
-    - name: Azure Container Service
+    - name: Azure Kubernetes Service (AKS)
       href: container-registry-auth-aks.md
 - name: Reference
   items: