Merge pull request #94627 from vhorne/ag-waf01

change link to WAF overview

Author: PRMerger8

articles/application-gateway/overview.md

@@ -6,7 +6,7 @@ author: vhorne
 ms.service: application-gateway
 ms.topic: overview
 ms.custom: mvc
-ms.date: 5/31/2019
+ms.date: 11/05/2019
 ms.author: victorh
 #Customer intent: As an IT administrator, I want to learn about Azure Application Gateways and what I can use them for.
 ---
@@ -43,11 +43,11 @@ The application gateway VIP on Standard_v2 or WAF_v2 SKU supports static VIP typ
 
 ## Web application firewall
 
-Web application firewall (WAF) is a feature of Application Gateway that provides centralized protection of your web applications from common exploits and vulnerabilities. WAF is based on rules from the [OWASP (Open Web Application Security Project) core rule sets](https://www.owasp.org/index.php/Category:OWASP_ModSecurity_Core_Rule_Set_Project) 3.1 (WAF_v2 only), 3.0, and 2.2.9. 
+Web application firewall (WAF) is a service that provides centralized protection of your web applications from common exploits and vulnerabilities. WAF is based on rules from the [OWASP (Open Web Application Security Project) core rule sets](https://www.owasp.org/index.php/Category:OWASP_ModSecurity_Core_Rule_Set_Project) 3.1 (WAF_v2 only), 3.0, and 2.2.9. 
 
 Web applications are increasingly targets of malicious attacks that exploit common known vulnerabilities. Common among these exploits are SQL injection attacks, cross site scripting attacks to name a few. Preventing such attacks in application code can be challenging and may require rigorous maintenance, patching and monitoring at many layers of the application topology. A centralized web application firewall helps make security management much simpler and gives better assurance to application administrators against threats or intrusions. A WAF solution can also react to a security threat faster by patching a known vulnerability at a central location versus securing each of individual web applications. Existing application gateways can be converted to a web application firewall enabled application gateway easily.
 
-For more information, see [Web application firewall (WAF) in Application Gateway](https://docs.microsoft.com/azure/application-gateway/waf-overview).
+For more information, see [What is Azure Web Application Firewall?](../web-application-firewall/overview.md).
 
 ## Ingress Controller for AKS
 Application Gateway Ingress Controller (AGIC) allows you to use Application Gateway as the ingress for an [Azure Kubernetes Service (AKS)](https://azure.microsoft.com/services/kubernetes-service/) cluster.