update changelog

CHANGELOG-EE

 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.11.0 (unreleased)
+  - Performance improvement of push rules
 
 v 8.10.2 (unreleased)
 
@@ -18,7 +19,6 @@ v 8.10.0
   - Fix of removing wiki data from index when project is deleted
   - Ticket-based Kerberos authentication (SPNEGO)
   - [Elastic] Suppress ActiveRecord::RecordNotFound error in ElasticIndexWorker
-  - Performance improvement of push rules
 
 v.8.9.7 (unreleased)
   - Fix error in admin dashboard when Geo is enabled and current node is nil.