Update whats-new.md

Author: SukanyaDas-MSFT

msteams-platform/whats-new.md

@@ -38,7 +38,7 @@ Teams platform features that are available to all app developers.</br>
 
 **2025 November**
 
-* ***November 21, 2025***: [Use the Performance Report tool to evaluate the efficiency of your web and tab apps on mobile.](resources/teams-mobile-best-practices.md)
+* ***November 21, 2025***: [Use the Performance Report tool to evaluate the efficiency of your web and tab apps on mobile.](resources/teams-mobile-best-practices.md#calculate-performance-metrics-for-apps)
 
 * ***November 19, 2025***: [Create and manage agent identities for your agent.](concepts/build-and-test/manage-your-apps-in-developer-portal.md#agent-identity-blueprint)