update toc and index files

Author: vhorne

articles/web-application-firewall/index.yml

@@ -42,6 +42,8 @@ landingContent:
             url: ./ag/application-gateway-web-application-firewall-portal.md
           - text: Web Application Firewall on Front Door
             url: ./afds/waf-front-door-create-portal.md
+          - text: WAF policy on Azure CDN
+            url: ./cdn/waf-cdn-create-portal.md
 
   # Card
   - title: Manage WAF rules on Application Gateway

articles/web-application-firewall/toc.yml

@@ -22,6 +22,7 @@
   expanded: true
   items:
   - name: Application Gateway
+    expanded: true
     items:
      - name: Deploy WAF v2 - ARM template
        displayName: Resource Manager