Remove extra blank line in markdown

Author: JarbasHorst

concepts/whats-new-overview.md

@@ -17,7 +17,6 @@ For details about previous updates to Microsoft Graph, see [Microsoft Graph what
 > [!IMPORTANT]
 > Features in _preview_ status are subject to change without notice, and might not be promoted to generally available (GA) status. Don't use preview features in production apps.
 
-
 ## February 2025: New in preview only 
 
 ### Tasks and plans