Clarify that Windows is prerequisite

Author: srdan-bozovic-msft

articles/purview/how-to-data-owner-policies-arc-sql-server.md

@@ -19,7 +19,7 @@ This how-to guide describes how a data owner can delegate authoring policies in
 
 ## Prerequisites
 [!INCLUDE [Access policies generic pre-requisites](./includes/access-policies-prerequisites-generic.md)]
-- SQL server version 2022 CTP 2.0 or later. [Follow this link](https://www.microsoft.com/sql-server/sql-server-2022)
+- SQL server version 2022 CTP 2.0 or later running on Windows. [Follow this link](https://www.microsoft.com/sql-server/sql-server-2022)
 - Complete process to onboard that SQL server with Azure Arc and enable Azure AD Authentication. [Follow this guide to learn how](https://aka.ms/sql-on-arc-AADauth).
 
 **Enforcement of policies for this data source is available only in the following regions for Microsoft Purview**