Add `tiup ctl pd` command in tiup page. (#5475) (#5506)
Add `tiup ctl pd` command in tiup page. (#5475) (#5506)

* cherry pick #5475 to master

Signed-off-by: ti-srebot <9a5274fd6b0ebeffb8aa3de76839934d21be0c45@pingcap.com>

* Apply suggestions from code review

Co-authored-by: Zhi Qi <e200112b6511da44060fee71504bdd4a65e44d97@users.noreply.github.com>
Co-authored-by: TomShawn <3d0966147538bc5ab020e8dffa2c0b746f9728a6@users.noreply.github.com>
pingcap/docs-cn,pingcap/docs-cn