changelog: add item to cover the fix on adding protection on maintena…

…nce requests when auth is enabled

Signed-off-by: Benjamin Wang <wachao@vmware.com>

CHANGELOG/CHANGELOG-3.6.md

@@ -58,6 +58,7 @@ See [code changes](https://github.com/etcd-io/etcd/compare/v3.5.0...v3.6.0).
 - Add [`etcd --max-concurrent-streams`](https://github.com/etcd-io/etcd/pull/14169) flag to configure the max concurrent streams each client can open at a time, and defaults to math.MaxUint32.
 - Add [`etcd grpc-proxy --experimental-enable-grpc-logging`](https://github.com/etcd-io/etcd/pull/14266) flag to logging all grpc requests and responses.
 - Add [`etcd --experimental-compact-hash-check-enabled --experimental-compact-hash-check-time`](https://github.com/etcd-io/etcd/issues/14039) flags to support enabling reliable corruption detection on compacted revisions.
+- Add [Protection on maintenance request when auth is enabled](https://github.com/etcd-io/etcd/pull/14663).
 
 ### etcd grpc-proxy