unicode: fix doc comment for Range32
unicode: fix doc comment for Range32

R=golang-dev, r
CC=golang-dev
http://codereview.appspot.com/4811050

Committer: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go