Update custom-waf-rules-overview.md

Author: cynthn

articles/web-application-firewall/ag/custom-waf-rules-overview.md

@@ -2,7 +2,7 @@
 title: Azure Web Application Firewall (WAF) v2 custom rules on Application Gateway  
 description: This article provides an overview of Web Application Firewall (WAF) v2 custom rules on Azure Application Gateway.
 services: web-application-firewall
-ms.topic: article
+ms.topic: concept-article
 author: vhorne
 ms.service: azure-web-application-firewall
 ms.date: 01/30/2024