you mean?
that stuff is generated by LDoc, and is also hosted at https://monome.org/norns.
contribute by forking norns repo, editing the comments in e.g. norns/lua/core/paramset.lua, and submitting a PR.
to regenerate the docs, install ldoc and run it from norns/.
(PS. i edited your post b/c discourse turned a pseudo-url into a broken link. now it’s a working link.)