doc: add go-tour-kr, a Korean translation of A Tour of Go

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5273043

doc/docs.html

@@ -157,12 +157,13 @@ Notable articles from the <a href="http://blog.golang.org/">Go Blog</a>.
 
 <h3 id="docs_jp">Japanese &mdash; 日本語</h3>
 <ul>
-<li><a href="http://golang.jp/">golang.jp</a> - Go documentation and news.
+<li><a href="http://golang.jp/">golang.jp</a> - Go documentation and news.</li>
 </ul>
 
 <h3 id="docs_kr">Korean &mdash; 한국어</h3>
 <ul>
-<li><a href="http://code.google.com/p/golang-korea">golang-korea</a> - Go documentation and news.
+<li><a href="http://go-tour-kr.appspot.com">A Tour of Go</a></li>
+<li><a href="http://code.google.com/p/golang-korea">golang-korea</a> - Go documentation and news.</li>
 </ul>
 
 </div>