Add vertical space between notes in method/class/module detail section.
Add vertical space between notes in method/class/module detail section.

Closes gh-199

thomthom/yard,ohai/yard,iankronquist/yard,travis-repos/yard,jreinert/yard,herosky/yard,herosky/yard,ohai/yard,jreinert/yard,amclain/yard,jreinert/yard,alexdowad/yard,alexdowad/yard,iankronquist/yard,travis-repos/yard,lsegal/yard,lsegal/yard,alexdowad/yard,iankronquist/yard,thomthom/yard,ohai/yard,herosky/yard,amclain/yard,lsegal/yard,amclain/yard,thomthom/yard