op-guide: add an IP note and update nodelalloc (#375)
op-guide: add an IP note and update nodelalloc (#375)

* op-guide: add an IP note

Via: https://github.com/pingcap/docs-cn/pull/622

* Update nodelalloc

Via: https://github.com/pingcap/docs-cn/pull/621

pingcap/docs,pingcap/docs,pingcap/docs