Fix typo in spec
Fix typo in spec

R=golang-dev, rsc
http://codereview.appspot.com/164052

Committer: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

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