Update release-notes.md

Added new  SQL recommendation for Azure SQL servers for March 2023

Author: AlizaBernstein

articles/defender-for-cloud/release-notes.md

@@ -19,9 +19,19 @@ To learn about *planned* changes that are coming soon to Defender for Cloud, see
 ## March 2023
 
 Updates in March include:
-
+- [New preview recommendation for Azure SQL Servers](#new-preview-recommendation-for-azure-sql-servers)
 - [New alert in Defender for Key Vault](#new-alert-in-defender-for-key-vault)
 
+### New preview recommendation for Azure SQL Servers 
+
+We have added a new recommendation for Azure SQL Servers, `Azure SQL Server authentication mode should be Azure Active Directory Only (Preview)`.
+
+The recommendation is based on the existing policy [`Azure SQL Database should have Azure Active Directory Only Authentication enabled`](https://ms.portal.azure.com/#view/Microsoft_Azure_Policy/PolicyDetailBlade/definitionId/%2fproviders%2fMicrosoft.Authorization%2fpolicyDefinitions%2fabda6d70-9778-44e7-84a8-06713e6db027)
+
+This recommendation disables local authentication methods and allows only Azure Active Directory Authentication which improves security by ensuring that Azure SQL Databases can exclusively be accessed by Azure Active Directory identities. 
+
+Learn how to [create servers with Azure AD-only authentication enabled in Azure SQL](/azure/azure-sql/database/authentication-azure-ad-only-authentication-create-server?tabs=azure-cli&view=azuresql).
+
 ### New alert in Defender for Key Vault
 
 Defender for Key Vault has the following new alert: