Use unit-binding, and link to the section that details handling first-class units in more length.
Use unit-binding, and link to the section that details handling first-class
units in more length.

svn: r13569

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket