Clarify WAF recommendations

The current recommendation puts a big emphasis on Application Gateway, which could lead to confusion that this is the only supported way to utilise DDoS Standard.

Author: bhummerstone

articles/virtual-network/ddos-protection-overview.md

@@ -47,9 +47,9 @@ DDoS Protection Standard can mitigate the following types of attacks:
 
 - **Volumetric attacks**: The attack's goal is to flood the network layer with a substantial amount of seemingly legitimate traffic. It includes UDP floods, amplification floods, and other spoofed-packet floods. DDoS Protection Standard mitigates these potential multi-gigabyte attacks by absorbing and scrubbing them, with Azure’s global network scale, automatically.
 - **Protocol attacks**: These attacks render a target inaccessible, by exploiting a weakness in the layer 3 and layer 4 protocol stack. It includes, SYN flood attacks, reflection attacks, and other protocol attacks. DDoS Protection Standard mitigates these attacks, differentiating between malicious and legitimate traffic, by interacting with the client, and blocking malicious traffic. 
-- **Resource (application) layer attacks**: These attacks target web application packets, to disrupt the transmission of data between hosts. The attacks include HTTP protocol violations, SQL injection, cross-site scripting, and other layer 7 attacks. Use the Azure [Application Gateway web application firewall](../application-gateway/application-gateway-web-application-firewall-overview.md?toc=%2fazure%2fvirtual-network%2ftoc.json), with DDoS Protection Standard, to provide defense against these attacks. There are also third-party web application firewall offerings available in the [Azure Marketplace](https://azuremarketplace.microsoft.com/marketplace/apps?page=1&search=web%20application%20firewall).
+- **Resource (application) layer attacks**: These attacks target web application packets, to disrupt the transmission of data between hosts. The attacks include HTTP protocol violations, SQL injection, cross-site scripting, and other layer 7 attacks. Use a Web Application Firewall, such as the Azure [Application Gateway web application firewall](../application-gateway/application-gateway-web-application-firewall-overview.md?toc=%2fazure%2fvirtual-network%2ftoc.json), as well as DDoS Protection Standard to provide defense against these attacks. There are also third-party web application firewall offerings available in the [Azure Marketplace](https://azuremarketplace.microsoft.com/marketplace/apps?page=1&search=web%20application%20firewall).
 
-DDoS Protection Standard protects resources in a virtual network including public IP addresses associated with virtual machines, load balancers, and application gateways. When coupled with the Application Gateway web application firewall, DDoS Protection Standard can provide full layer 3 to layer 7 mitigation capability.
+DDoS Protection Standard protects resources in a virtual network including public IP addresses associated with virtual machines, load balancers, and application gateways. When coupled with the Application Gateway web application firewall, or a third-party web application firewall deployed in a virtual network with a public IP, DDoS Protection Standard can provide full layer 3 to layer 7 mitigation capability.
 
 ## DDoS Protection Standard features