fix naked < and > as reported by Peter Williams <> (i thought these were legal in <pre> blocks)
fix naked < and > as reported by Peter Williams <>
(i thought these were legal in <pre> blocks)

R=rsc
CC=golang-dev, pwil3058
http://codereview.appspot.com/181055

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