sql-statement: update `admin` related statements (#2928)
sql-statement: update `admin` related statements (#2928)

* sql-statement: update `admin` related statements

* Apply suggestions from code review

* sql-statements: make lint happy

* fix a link

* add missing 3rd headers

* fix format

Co-authored-by: Keke Yi <4b13e11d5beb5669a80650bc9e0535372af5b679@users.noreply.github.com>
Co-authored-by: toutdesuite <48d3065aa52b966b371839c90fbef6a5acd6eafb@163.com>
Co-authored-by: yikeke <9eab6a9266c1a471ca02f5c04fa0a3b857620cf9@pingcap.com>
pingcap/docs,pingcap/docs,pingcap/docs