docs: fix typo

doc/index.html

@@ -116,7 +116,7 @@ server.listen(1337, "127.0.0.1");
         <li><a href="http://nodejs.org/docs/v0.4.12/api/index.html">Documentation</a>
       </ul>
 
-      <p>2011.10.10 v0.5.21 (unstable)
+      <p>2011.10.21 v0.5.10 (unstable)
       <ul class="release">
         <li><a href="http://nodejs.org/dist/v0.5.10/node-v0.5.10.tar.gz"><code>node-v0.5.10.tar.gz</code> Source code</a>
         <li><a href="http://nodejs.org/dist/v0.5.10/node.exe"><code>node.exe</code> Windows executable</a>