chore: update the documentation link in the comment
chore: update the documentation link in the comment

Close #12462.

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