upper-case "Ruby" in TomDoc as it is a proper noun

I _believe_ the correct capitalization of "Ruby" is with "R".  If so, and in an attempt to make the documentation consistent, I've tracked down as many of the instances in `trunk` which should be uppercase as I could and changed them in this PR.  I've intentionally ignored some cases in comments (non-Tomdoc'd) or in licensing information which will not appear in the public documentation.