doc: update footer text

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5920043

lib/godoc/godoc.html

@@ -52,8 +52,9 @@
 
 <div id="footer">
 Build version {{html .Version}}.<br>
-Except as noted, this content is licensed under a
-Creative Commons Attribution 3.0 License.<br>
+Except as <a href="http://code.google.com/policies.html#restrictions">noted</a>,
+the content of this page is licensed under the Creative Commons Attribution 3.0 License,<br>
+and code samples are licensed under a <a href="/LICENSE">BSD-style license</a>.<br>
 <a href="/doc/tos.html">Terms of Service</a>
 </div>