Update Changelog

operations/helm/charts/mimir-distributed/CHANGELOG.md

@@ -28,6 +28,7 @@ Entries should include a reference to the Pull Request that introduced the chang
 
 ## main / unreleased
 
+* [ENHANCEMENT] Add `namespaceOverride` option to change default Helm namespace installation behavior.
 * [CHANGE] Do not render resource blocks for `initContainers`, `nodeSelector`, `affinity` and `tolerations` if they are empty.
 * [CHANGE] Rollout-operator: remove default CPU limit. #7125
 * [CHANGE] Ring: relaxed the hash ring heartbeat period and timeout for distributor, ingester, store-gateway and compactor: #6860