Add migration to WebAssembly information to PNaCl / NaCl docs.

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>
+<b><font color="#cc0000">
+NOTE:
+Deprecation of the technologies described here has been announced
+for platforms other than ChromeOS.<br/>
+Please visit our
+<a href="/native-client/migration">migration guide</a>
+for details.
+</font></b>
+<hr/><section id="help-with-nacl">
+<h1 id="help-with-nacl">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">
@@ skipping 22 matching lines @@
 (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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