Merge pull request #14069 from ahrtr/update_3.5_changelog_migrate

Update changelog-3.5 to correct the entry for decommissioning `etcdctl migrate`

CHANGELOG/CHANGELOG-3.5.md

@@ -313,7 +313,7 @@ Note that any `etcd_debugging_*` metrics are experimental and subject to change.
 - Add [`etcdctl member list -w=json --hex`](https://github.com/etcd-io/etcd/pull/11812) flag to print memberListResponse in hex format json.
 - Changed [`etcdctl lock <lockname> exec-command`](https://github.com/etcd-io/etcd/pull/12829) to return exit code of exec-command.
 - [New tool: `etcdutl`](https://github.com/etcd-io/etcd/pull/12971) incorporated functionality of: `etcdctl snapshot status|restore`, `etcdctl backup`, `etcdctl defrag --data-dir ...`.
-- [ETCDCTL_API=2 `etcdctl migrate`](https://github.com/etcd-io/etcd/pull/12971) has been decomissioned. Use etcd <=v3.4 to restore v2 storage.
+- [ETCDCTL_API=3 `etcdctl migrate`](https://github.com/etcd-io/etcd/pull/12971) has been decommissioned. Use etcd <=v3.4 to restore v2 storage.
 
 ### gRPC gateway