doc: use author's titles for linked resources

Update Collaborator Guide links to use the title of the item being
linked.

PR-URL: https://github.com/nodejs/node/pull/24837


Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>