fix doc
fix doc

Signed-off-by: Jay Lee <2b53900d99d9dec83fb079f280f37f8f23b61cc6@gmail.com>

ajityagaty/etcd,rnaveiras/etcd,mkumatag/etcd,etcd-io/etcd,rnaveiras/etcd,coreos/etcd,coreos/etcd,etcd-io/etcd,etcd-io/etcd,mqliang/etcd,mqliang/etcd,mkumatag/etcd,gyuho/etcd,rnaveiras/etcd,ajityagaty/etcd,ajityagaty/etcd,mqliang/etcd,gyuho/etcd,mkumatag/etcd