First two links are 404s.
Do we publish rubygems rdoc somewhere on rubygems.org ? I'm trying to find a sanctioned place to link to and can't find one.
I also just found these 404s while looking for docs, then spent 20 minutes trying to figure out where they should point (to fix and PR), then I found this issue.
I'd remove the links if there is no proper target; it's a total time waste.
Pushed an update today to just remove the bad links. At some point we may be back to actually building the rdoc, but for now, there's no point to the links.
I strongly suspect the specifications guide is out of sync with the actual code at this point anyhow, but that's a problem for another day.