Years ago, I started using Ruby with SketchUp. Sometime ago, I got frustrated with documentation generated by RDoc and YARD, and started working on a plug-in for YARD that I felt improved upon it, especially the UX.
I’ve posted docs for several Ruby versions online. You may find it easier to use, and the Ruby source code has a lot of documentation it, along with many separate documents (See the ‘Docs List’).
Ruby 2.0 - used in SU
Home Page - UI info, list all docs posted, etc
Comments / Feedback / Suggestions to (new Gitter ‘Room’):
BTW, almost to the point of releasing a gem; my open source contribution for the year…