Update whats-new.md

Author: guywi-ms

articles/sentinel/whats-new.md

@@ -44,11 +44,12 @@ For more information, see:
 - [Use STIX/TAXII to import and export threat intelligence in Microsoft Sentinel](connect-threat-intelligence-taxii.md)
 - [Export threat intelligence](work-with-threat-indicators.md#export-threat-intelligence)
 
-### Standardized account entity naming in incidents and alerts - update queries and automation by December 13, 2025
+### Call to action: update queries and automation by December 13, 2025 - standardized account entity naming in incidents and alerts
 
 Microsoft Sentinel is updating how it identifies account entities in incidents and alerts. This change introduces a standardized naming logic to improve consistency and reliability across your analytics and automation workflows.
 
-This change might affect your analytic rules, automation rules, playbooks, workbooks, hunting queries, and custom integrations.
+> [!IMPORTANT]
+> This change might affect your analytic rules, automation rules, playbooks, workbooks, hunting queries, and custom integrations.
 
 Sentinel will now select the most reliable account identifier using the following priority: