Changelog: correct the 3.4 changelog item
Changelog: correct the 3.4 changelog item

There are duplicated items for https://github.com/etcd-io/etcd/pull/14441.
Since it's a etcdctl side change, so we should keep the item under etcdctl,
and remove the duplicated item under "etcd server"

Signed-off-by: Benjamin Wang <a1713d12b1b05630690f22cadfd282d625d8acb2@vmware.com>

ajityagaty/etcd,etcd-io/etcd,ajityagaty/etcd,etcd-io/etcd,etcd-io/etcd,ajityagaty/etcd