Fix doc links

Author: brson

_layouts/default.html

@@ -25,11 +25,11 @@
       </li>
       <li class="col-xs-4 col-md-2"><h2>Docs (Beta)</h2>
         <ul>
-          <li><a href="http://doc.rust-lang.org/1.0.0-beta/book/">Book</a></li>
-          <li><a href="http://doc.rust-lang.org/1.0.0-beta/reference.html">Reference</a></li>
+          <li><a href="http://doc.rust-lang.org/1.0.0-beta.2/book/">Book</a></li>
+          <li><a href="http://doc.rust-lang.org/1.0.0-beta.2/reference.html">Reference</a></li>
           <li>
-            <a href="http://doc.rust-lang.org/1.0.0-beta/std/">API docs</a></li>
-            <li><a href="http://doc.rust-lang.org/1.0.0-beta/">All docs</a>
+            <a href="http://doc.rust-lang.org/1.0.0-beta.2/std/">API docs</a></li>
+            <li><a href="http://doc.rust-lang.org/1.0.0-beta.2/">All docs</a>
           </li>
         </ul>
       </li>