Reference: Ability to overwrite @return

Hacking on the reference for processing-io I ran into two things that I couldn't get to work - and I think which might be limitations of the script that cranks out the reference. Posting them as separate issues for reference. Please feel free to close if this is known or very much the expected behavior. (And please tell me if there is a way to do it altogether!)

In Javadoc I sometimes use @return to describe the meaning of the return value. (E.g. that GPIO.digitalRead() returns either GPIO.HIGH or GPIO.LOW.) However the generated reference always just specifies the return type, which is perhaps not in all cases intuitive. I tried overwriting where it mattered in the XML files (setting <returns></returns>, which I found in the video library's files), but this didn't have an influence on the output either.