doc: add missing changelog links

Refs: https://github.com/nodejs/node/pull/38507
Refs: https://github.com/nodejs/node/pull/38874

PR-URL: https://github.com/nodejs/node/pull/39016


Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>