go spec: be precise about newlines
go spec: be precise about newlines

Several places mentioned tokens spanning "multiple lines"
which is not a well-defined term in the spec; newline is.

R=golang-dev, rsc, r
CC=golang-dev
http://codereview.appspot.com/5490046

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang