Merge pull request #305191 from pradeepmi-MSFT/patch-7

(AzureCXP) fixes MicrosoftDocs/azure-docs-pr#489466

Author: prmerger-automator[bot]

articles/web-application-firewall/quickstart-web-application-firewall-terraform.md

@@ -54,6 +54,9 @@ The sample code for this article is located in the [Azure Terraform GitHub repo]
 1. Create a file named `main.tf`, and insert the following code:
     :::code language="Terraform" source="~/terraform_samples/quickstart/101-web-application-firewall/main.tf":::
 
+>[!NOTE]  
+> Use `waf_configuration` to define WAF settings directly on the Application Gateway. Use `firewall_policy_id` to associate an existing WAF policy resource with the Application Gateway. Only one method should be used in practice.
+
 1. Create a file named `outputs.tf`, and insert the following code:
     :::code language="Terraform" source="~/terraform_samples/quickstart/101-web-application-firewall/outputs.tf":::