fix toc and build validation issues

Author: amsliu

support/azure/azure-kubernetes/error-codes/aks-upgrade-blocked.md

@@ -1,12 +1,12 @@
 ---
 title: AKS upgrade not allowed or blocked because of unsupported Kubernetes version or node pool version skew
 description: Learn how to troubleshoot AKS upgrade not allowed or blocked because of unsupported Kubernetes version or node pool version skew.
-ms.date: 08/20/2025
+ms.date: 08/21/2025
 editor: v-jsitser
 ms.reviewer: v-liuamson
 ms.service: azure-kubernetes-service
+ms.custom: sap:Create, Upgrade, Scale and Delete operations (cluster or nodepool)
 #Customer intent: As an Azure Kubernetes user, I want to troubleshoot an AKS upgrade not allowed or blocked because of an unsupported Kubernetes version or node pool version skew so that I can successfully upgrade an AKS cluster by using the Azure CLI.
-ms.custom: sap: Create, Upgrade, Scale and Delete operations (cluster or node pool)
 ---
 # Troubleshoot AKS upgrade errors because of version skew, incompatibility, or lack of support
 

support/azure/azure-kubernetes/toc.yml

@@ -1,3 +1,4 @@
+items:
 - name: Welcome
   href: welcome-azure-kubernetes.yml
 
@@ -455,7 +456,7 @@
     href: error-codes/windows-cse-error-check-api-server-connectivity-error.md
   - name: ZonalAllocationFailed, AllocationFailed, or OverconstrainedAllocationRequest error
     href: error-codes/zonalallocation-allocationfailed-error.md
-  - name: AKS upgrade not allowed or blocked due to unsupported Kubernetes version or node pool version skew
+  - name: AKS upgrade errors because of version skew, incompatibility, or lack of support
     href: error-codes/aks-upgrade-blocked.md
   - name: SubnetIsDelegated error
     href: error-codes/subnetisdelegated-error.md