doc: mention godoc.org in "How to Write Go Code"

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/8344043

doc/code.html

@@ -22,7 +22,7 @@ A similar explanation is available as a
 </p>
 
 
-<h2 id="GOPATH">Code organization</h2>
+<h2 id="Organization">Code organization</h2>
 
 <h3 id="Workspaces">Workspaces</h3>
 
@@ -569,8 +569,9 @@ import "code.google.com/p/go.example/newmath"
 <p>
 This convention is the easiest way to make your Go packages available for
 others to use.
-The <a href="http://code.google.com/p/go-wiki/wiki/Projects">Go Community Wiki</a>
-has a list of external Go projects including programs and libraries.
+The <a href="http://code.google.com/p/go-wiki/wiki/Projects">Go Wiki</a>
+and <a href="http://godoc.org/">godoc.org</a>
+provide lists of external Go projects.
 </p>
 
 <p>