faq: fix minor errors in programs reported by Wojciech Mikanik
faq: fix minor errors in programs reported by Wojciech Mikanik

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/4114041
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go