tiflash: update tiflash deploy using tiup (#2194)
tiflash: update tiflash deploy using tiup (#2194)

* tiflash: update tiflash deploy using tiup

* Apply suggestions from code review

Co-Authored-By: Keke Yi <4b13e11d5beb5669a80650bc9e0535372af5b679@users.noreply.github.com>

* Apply suggestions from code review

Co-Authored-By: Keke Yi <4b13e11d5beb5669a80650bc9e0535372af5b679@users.noreply.github.com>

* Update reference/tiflash/deploy.md

Co-authored-by: Keke Yi <4b13e11d5beb5669a80650bc9e0535372af5b679@users.noreply.github.com>
pingcap/docs,pingcap/docs,pingcap/docs