Update changelog for fixing issue in data manager

Author: pnrgenc

CHANGELOG.md

@@ -5,6 +5,7 @@ Fixes:
 - [server-stats] Fix data point calculation in job
 - [TopEventsJob] preserver previous state if overwriting fails
 - [ui] scroll top on step changes in drawers
+- [data-manager] Modifying existing values when segment values want to be updated in the Data Manager
 
 Enterprise fixes:
 - [drill] Encoding url component before changing history state