doc: update pr-url for DEP0016 EOL

Refs: https://github.com/nodejs/node/pull/31167
PR-URL: https://github.com/nodejs/node/pull/31675


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>