Update grafana tikv dashboard doc (#3042)
Update grafana tikv dashboard doc (#3042)

* Update grafana tikv dashboard doc

* fix lint

* Fix first round of review

* fix

* Fix some errors like ops

* fix ditto

* Update grafana-tikv-dashboard.md

Co-authored-by: TomShawn <3d0966147538bc5ab020e8dffa2c0b746f9728a6@users.noreply.github.com>

* Update grafana-tikv-dashboard.md

Co-authored-by: TomShawn <3d0966147538bc5ab020e8dffa2c0b746f9728a6@users.noreply.github.com>

* Update grafana-tikv-dashboard

* Update grafana-tikv-dashboard.md

* fix typos and refine format

* Update grafana-tikv-dashboard.md

* add content

Co-authored-by: TomShawn <3d0966147538bc5ab020e8dffa2c0b746f9728a6@users.noreply.github.com>
pingcap/docs,pingcap/docs,pingcap/docs