godoc: change od.Dir -> os.FileInfo in comments
godoc: change od.Dir -> os.FileInfo in comments

R=gri, r
CC=golang-dev, rsc
http://codereview.appspot.com/819042

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