doc: suggest code.google.com/p/go instead of go.googlecode.com/hg

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5491069

doc/install.html

@@ -118,7 +118,7 @@ Mercurial versions 1.7.x and up require the configuration of
 (CAs). Error messages of the form:
 </p>
 <pre>
-warning: go.googlecode.com certificate with fingerprint b1:af: ... bc not verified (check hostfingerprints or web.cacerts config setting)
+warning: code.google.com certificate with fingerprint b1:af: ... bc not verified (check hostfingerprints or web.cacerts config setting)
 </pre>
 <p>
 when using Mercurial indicate that the CAs are missing.
@@ -136,7 +136,7 @@ and make sure the <code>go</code> directory does not exist.
 Then check out the repository:</p>
 
 <pre>
-$ hg clone -u release https://go.googlecode.com/hg/ go
+$ hg clone -u release https://code.google.com/p/go
 </pre>
 
 <h2 id="install">Install Go</h2>