etcd-dump-logs: correct logging message word
etcd-dump-logs: correct logging message word

Signed-off-by: Guangming Wang <2dca52765acf93a024077590b100d00c3300ed67@daocloud.io>
mqliang/etcd,dannysauer/etcd,mkumatag/etcd,etcd-io/etcd,coreos/etcd,coreos/etcd,mqliang/etcd,cockroachdb/etcd,ajityagaty/etcd,gyuho/etcd,li-ang/etcd,rnaveiras/etcd,ajityagaty/etcd,dannysauer/etcd,rnaveiras/etcd,rnaveiras/etcd,etcd-io/etcd,li-ang/etcd,ajityagaty/etcd,etcd-io/etcd,mkumatag/etcd,cockroachdb/etcd,gyuho/etcd,mqliang/etcd,mkumatag/etcd