doc: add Minqi Pan to collaborators

Also changed alias P.S.V.R to Minqi Pan.

Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/6387