go-tour: minor HTML/link error fixes         Fix issue 3421 for the go project.
go-tour: minor HTML/link error fixes
        Fix issue 3421 for the go project.

R=golang-dev, adg, r
CC=golang-dev
http://codereview.appspot.com/5946048

Committer: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

golang-tr/go-tour-tr,golang-tr/go-tour-tr