Move activity log webhook schema

to the right TOC place

Author: rboucher

articles/azure-monitor/toc.yml

@@ -1005,6 +1005,8 @@
         href: platform/alerts-activity-log.md
       - name: Migrate management events to activity log alerts
         href: platform/migrate-management-alerts.md
+      - name: Webhook schema
+        href: platform/activity-log-alerts-webhook.md
     - name: Service health alerts in activity log
       items:
       - name: View notifications
@@ -1023,8 +1025,6 @@
         href: platform/alerts-common-schema-definitions.md   
       - name: Integrate the common alert schema with Logic Apps
         href: platform/alerts-common-schema-integrations.md   
-      - name: Webhook schema
-        href: platform/activity-log-alerts-webhook.md
       - name: SMS alert behavior
         href: platform/alerts-sms-behavior.md
       - name: Notification rate limiting