Should 100% be a link to meta (or an external document) which contains one para description of the setting. Any more literature and nobody bothers to actually read it.
We need it on meta or another external site because it is easier for us to manage any discrepancy. If it is built into discourse package, it will be hard to add the most accurate information due to the reason that the process is long between a pull request being written, tested, reviewed, merged then actually being deployment to every customer running different branches. The info could get out dated pretty quickly.