docs(changelog) add leader election fix

CHANGELOG.md

@@ -49,6 +49,12 @@ you should edit it (`kubectl edit validatingwebhookconfiguration
 kong-validations`) and add `kongclusterplugins` under the `resources` block for
 the `configuration.konghq.com` API group.
 
+#### Breaking Changes
+
+- The `--leader-elect` flag has been removed. Leader election is now enabled or
+  disabled automatically based on the database mode.
+  [#2053](https://github.com/Kong/kubernetes-ingress-controller/issues/2053)
+
 #### Added
 
 - Added validation for `Gateway` objects in the admission webhook
@@ -61,6 +67,10 @@ the `configuration.konghq.com` API group.
 - a Gateway controller has been added in support of [Gateway APIs][gwapi].
   This controller is foundational and doesn't serve any end-user purpose alone.
   [#1945](https://github.com/Kong/kubernetes-ingress-controller/issues/1945)
+- The new `--election-namespace` flag sets the leader election namespace. This
+  is normally only used if a controller is running outside a Kubernetes
+  cluster.
+  [#2053](https://github.com/Kong/kubernetes-ingress-controller/issues/2053)
 
 [k8s-fg]:https://kubernetes.io/docs/reference/command-line-tools-reference/feature-gates/
 [kic-fg]:https://github.com/Kong/kubernetes-ingress-controller/blob/main/FEATURE_GATES.md
@@ -80,6 +90,10 @@ the `configuration.konghq.com` API group.
 - Fixed a race condition where multiple actors may simultaneously attempt to
   create the configured Enterprise workspaces.
   [#2070](https://github.com/Kong/kubernetes-ingress-controller/pull/2070)
+- Fixed incorrect leader election behavior. Previously, non-leader instances
+  would still attempt to update Kong configuration, but would not scan for
+  Kubernetes resources to translate into Kong configuration.
+  [#2053](https://github.com/Kong/kubernetes-ingress-controller/issues/2053)
 
 ## [2.0.6]