Add warning

Author: nhebbar2011

docs/sql-server/azure-arc/faq.yml

@@ -25,6 +25,9 @@ sections:
           1. Set the value for excluded instances in the custom definition.
           1. Target the subscription and resource group.
 
+          > [!WARNING]  
+          > SQL Server instances using Pay-as-you-go (PAYG) cannot be excluded.
+
       - question: Is the data from my instance of SQL Server sent to Azure?
         answer: |
            No. Microsoft only captures metadata and information about your SQL Server to help troubleshoot and inventory. The data sent does not include user data or about your utilization of SQL Server.