toc update

Author: Ankita Dutta

articles/backup/toc.yml

@@ -282,6 +282,8 @@
         href: backup-during-vm-creation.md
       - name: Back up an Azure VM using Enhanced policy
         href: backup-azure-vms-enhanced-policy.md
+      - name: Back up an Azure VM in Azure extended zones (preview)
+        href: backup-azure-vms-extended-zones.md
       - name: Back up Azure VM with agentless multi-disk crash-consistent backup
         href: backup-azure-vms-agentless-multi-disk-crash-consistent.md
       - name: Back up an Azure VM from VM settings