spec: fix small typo in comment for example
spec: fix small typo in comment for example

R=golang-dev, mirtchovski, r
CC=golang-dev
https://codereview.appspot.com/14227043

Committer: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

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