Add PNaCl release note about how to try out Subzero / which flag to set.

native_client_sdk/doc_generated/help.html

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 <section id="help-with-nacl">
 <span id="help"></span><h1 id="help-with-nacl"><span id="help"></span>Help with NaCl</h1>
 <p>Check the documentation resources below for help with common issues and
 problems. For additional questions, reach out to the Native Client
 community in the forums below. You can also <a class="reference internal" href="#report-issue"><em>report new issues</em></a> using the Native Client issue tracker.</p>
 <h2 id="documentation">Documentation</h2>
 <ul class="small-gap">
 <li><a class="reference internal" href="/native-client/sdk/release-notes.html"><em>Release Notes</em></a>.</li>
 <li><a class="reference internal" href="/native-client/faq.html"><em>FAQ</em></a>.</li>
 </ul>
 <h2 id="forums">Forums</h2>
-<ul class="small-gap">
+<ul class="small-gap" id="forums-list">
 <li>For new Native Client developers: <a class="reference external" href="http://stackoverflow.com/questions/tagged/google-nativeclient">Stack Overflow</a> is a
 great resource &#8212; check this forum first for answers to your
 questions.</li>
 <li>For in-depth technical discussions: <a class="reference external" href="https://groups.google.com/group/native-client-discuss">native-client-discuss mailing
 list</a> is a good
 group for detailed technical discussions about bugs and other Native Client
 issues.</li>
 <li>For announcements, follow the <a class="reference external" href="http://groups.google.com/group/native-client-announce">native-client-announce mailing list</a>.</li>
 <li>For 140 character goodness follow <a class="reference external" href="https://twitter.com/nativeclient">&#64;nativeclient</a> on Twitter.</li>
 </ul>
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 (only visible to the security team).</li>
 <li>A <a class="reference external" href="https://code.google.com/p/chromium/issues/entry?template=NaCl%20Issue">Native Client + Chrome integration issue</a>.</li>
 <li>A <a class="reference external" href="https://code.google.com/p/chromium/issues/entry?template=Security%20Bug">Native Client + Chrome integration security issue</a>
 (only visible to the security team).</li>
 </ul>
 </li>
 </ol>
 </section>
 
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