doc: refer to http://build.golang.org/ where applicable

R=golang-dev, bradfitz, adg
CC=golang-dev
https://golang.org/cl/5501062

doc/contrib.html

@@ -41,7 +41,7 @@ are particularly in need of outside help.
 
 <h2 id="the_go_project">The Go Project</h2>
 
-<h3 id="build_status"><a href="http://godashboard.appspot.com/">Build Status</a></h3>
+<h3 id="build_status"><a href="http://build.golang.org/">Build Status</a></h3>
 <p>View the status of Go builds across the supported operating
 systems and architectures.</p>
 

doc/devel/index.html

@@ -4,7 +4,7 @@
 <li><a href="roadmap.html">Roadmap</a></li>
 <li><a href="release.html">Release history</a></li>
 <li><a href="weekly.html">Weekly snapshot history</a></li>
-<li><a href="http://godashboard.appspot.com">Build and benchmark status</a></li>
+<li><a href="http://build.golang.org/">Build status</a></li>
 </ul>
 <ul>
 <li><a href="../contribute.html">Contributing code</a></li>

doc/root.html

@@ -90,7 +90,7 @@ google.setOnLoadCallback(loadFeed);
           <ul>
             <li><a href="http://godashboard.appspot.com/package">Package Dashboard</a></li>
             <li><a href="http://code.google.com/p/go/issues">Issue Tracker</a></li>
-            <li><a href="http://godashboard.appspot.com/">Build Status</a></li>
+            <li><a href="http://build.golang.org/">Build Status</a></li>
             <li><a href="http://code.google.com/p/go/source/browse/">Go Source</a> [<a href="http://code.google.com/p/go/source/list">changes</a>]</li>
             <li><a href="/pkg/">Package Reference</a></li>
             <li><a href="/doc/go_spec.html">Language Specification</a></li>