doc: Remove obsolete references to weekly releases.

This was misleading and often confusing for new users.

Leaving the actual weekly release history page for historical reference.

R=golang-dev, rsc, adg
CC=golang-dev
https://golang.org/cl/6555053

doc/contrib.html

@@ -34,9 +34,6 @@ We encourage all Go users to subscribe to
 <h3 id="release"><a href="/doc/devel/release.html">Release History</a></h3>
 <p>A summary of the changes between Go releases.</p>
 
-<h3 id="weekly"><a href="/doc/devel/weekly.html">Weekly Snapshot History</a></h3>
-<p>A summary of the changes between weekly snapshots of Go.</p>
-
 <h3 id="golang-dev"><a href="http://groups.google.com/group/golang-dev">Developer Mailing List</a></h3>
 <p>The <a href="http://groups.google.com/group/golang-dev">golang-dev</a>
 mailing list is for discussing and reviewing code for the Go project.</p>

doc/devel/release.html

@@ -3,11 +3,8 @@
 }-->
 
 <p>This page summarizes the changes between official stable releases of Go.
-Between releases we issue less stable
-<a href="http://blog.golang.org/2011/03/go-becomes-more-stable.html">weekly snapshots</a>.
-The <a href="weekly.html">weekly snapshot history</a> contains more detail,
-and the <a href="http://code.google.com/p/go/source/list">Mercurial change log</a>
-has full details.</p>
+The <a href="http://code.google.com/p/go/source/list">Mercurial change log</a>
+has the full details.</p>
 
 <p>To update to a specific release, use:</p>