Update utility-applications.md

Customers are using 3rd party AV that are causing issues with all the Cloud Management capabilities and we have no concrete documentation that states this hence editing this.

Author: SharmaKartikay

azure-stack/hci/concepts/utility-applications.md

@@ -15,7 +15,7 @@ Azure Stack HCI is a hyperconverged infrastructure stack that’s uniquely pos
 
 This article spotlights utility applications from Microsoft partners that support the operating system.
 
-We recommend using Microsoft Defender Antivirus with the operating system. Other antivirus and malware detection software and services might impact the operating system’s ability to receive updates. This guidance might change in future releases of the operating system.
+We recommend using Microsoft Defender Antivirus with the Azure Stack HCI Operating System. Third party Antivirus and security software must be designed and approved for Azure Stack HCI. Other antivirus and malware detection software and services might impact the operating system’s ability to receive updates. This guidance might change in future releases of the operating system.
 
 ## Partner spotlight