process,doc: add missing deprecation code

Refs: https://github.com/nodejs/node/pull/36902

PR-URL: https://github.com/nodejs/node/pull/37091


Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>