revised docs for 'delay', which now accepts a body sequence instead of a single expression
revised docs for 'delay', which now accepts a body sequence instead of a single expression

svn: r16783

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