Merge pull request #12355 from cfc4n/changelog_gettoken

CHANGELOG: update for #12165 , #12264 .

CHANGELOG-3.5.md

@@ -167,6 +167,8 @@ Note that any `etcd_debugging_*` metrics are experimental and subject to change.
   - Previously, `clientv3.WithRequireLeader(ctx)` was overwriting existing context keys.
 - Fix [watch leak caused by lazy cancellation](https://github.com/etcd-io/etcd/pull/11850). When clients cancel their watches, a cancel request will now be immediately sent to the server instead of waiting for the next watch event.
 - Make sure [save snapshot downloads checksum for integrity checks](https://github.com/etcd-io/etcd/pull/11896).
+- Fix [auth token invalid after watch reconnects](https://github.com/etcd-io/etcd/pull/12264). Get AuthToken automatically when clientConn is ready.
+- Improve [clientv3:get AuthToken gracefully without extra connection](https://github.com/etcd-io/etcd/pull/12165).
 
 ### Package `lease`