docs/op-guide: fix two broken links (#3710)
docs/op-guide: fix two broken links (#3710)

Signed-off-by: lilin90 <c684465c17314189c18707959627e2ec4fdec2d0@pingcap.com>
pingcap/tikv,BusyJay/tikv,BusyJay/tikv,pingcap/tikv,BusyJay/tikv,BusyJay/tikv,c4pt0r/tikv