doc: link to Go coding screencast

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6849046

doc/code.html

@@ -10,6 +10,10 @@ introduces the <a href="/cmd/go/">go command</a>, the standard way to fetch,
 build, and install Go packages and commands.
 </p>
 
+<p>
+This content is also available as a <a href="http://www.youtube.com/watch?v=XCsL89YtqCs">screencast</a>.
+</p>
+
 
 <h2 id="GOPATH">Code organization</h2>
 

doc/docs.html

@@ -45,8 +45,10 @@ learned. You can <a href="http://tour.golang.org/">take the tour online</a> or
 
 <h3 id="code"><a href="code.html">How to write Go code</a></h3>
 <p>
-How to use the <a href="/cmd/go/">go command</a> to fetch, build, and install
-packages, commands, and run tests.
+Also available as a
+<a href="http://www.youtube.com/watch?v=XCsL89YtqCs">screencast</a>, this doc
+explains how to use the <a href="/cmd/go/">go command</a> to fetch, build, and
+install packages, commands, and run tests.
 </p>
 
 <h3 id="effective_go"><a href="effective_go.html">Effective Go</a></h3>