op-guide: fix the file name and join (#441)
op-guide: fix the file name and join (#441)

* op-guide: fix the file name

Via: https://github.com/pingcap/docs-cn/pull/677

* op-guide: fix join

Via: https://github.com/pingcap/docs-cn/pull/680

pingcap/docs,pingcap/docs,pingcap/docs