update toc

Author: halkazwini

articles/network-watcher/toc.yml

@@ -189,8 +189,6 @@
         href: nsg-flow-logs-azure-resource-manager.md
       - name: Built-in Policy
         href: nsg-flow-logs-policy-portal.md
-    - name: Migrate NSG flow logs
-      href: nsg-flow-logs-migrate.md
     - name: Manage VNet flow logs
       items:
       - name: Azure portal
@@ -199,6 +197,8 @@
         href: vnet-flow-logs-powershell.md
       - name: Azure CLI
         href: vnet-flow-logs-cli.md
+    - name: Migrate NSG flow logs
+      href: nsg-flow-logs-migrate.md
     - name: Read NSG flow logs
       href: network-watcher-read-nsg-flow-logs.md
     - name: Analyze NSG flow logs