doc: add references to PR communication articles

Added some references to PR communication articles in
Helpful Ressources inside COLLABORATOR_GUIDE.md

PR-URL: https://github.com/nodejs/node/pull/17902
Fixes: https://github.com/nodejs/node/issues/16359


Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>