Fix a few grammatical errors and typos in the reference tag docs.
Fix a few grammatical errors and typos in the reference tag docs.

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