small repairs to docs on 'scribblings in "info.rkt"
small repairs to docs on 'scribblings in "info.rkt"

Merge to v6.4

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