go_spec: fix typo (pointed out by Hiroshi Iwatani)
go_spec: fix typo (pointed out by Hiroshi Iwatani)

R=iant
CC=golang-dev
http://codereview.appspot.com/2128045

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go