cmd/dist: instruct the user to bind $GOBIN on Plan 9
cmd/dist: instruct the user to bind $GOBIN on Plan 9

R=seed, rminnich, bradfitz, r
CC=golang-dev
https://codereview.appspot.com/7395059

Committer: Ron Minnich <f569d0af9a3481c4007b95c7180d6c41009f2513@gmail.com>
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go