doc: add Korean Go site

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4515092

doc/docs.html

@@ -79,6 +79,11 @@ An introduction to Go for C++ programmers.
 <li><a href="http://golang.jp/">golang.jp</a> - Go documentation and news.
 </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.
+</ul>
+
 <h3 id="docs_ru">Russian &mdash; Русский</h3>
 <ul>
 <li><a href="http://golanguage.ru/">golanguage.ru</a> - Go documentation.