[DOCS] Add supported OSs and platforms to the SDK download page.

native_client_sdk/doc_generated/sitemap.html

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 <section id="native-client-documentation-sitemap">
 <h1 id="native-client-documentation-sitemap">Native Client Documentation Sitemap</h1>
 <p>Contents:</p>
 <div class="toctree-wrapper compound">
 <ul class="small-gap">
 <li class="toctree-l1"><a class="reference internal" href="/native-client/overview.html">Technical Overview</a><ul class="small-gap">
 <li class="toctree-l2"><a class="reference internal" href="/native-client/overview.html#why-use-native-client">Why use Native Client?</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/overview.html#benefits-of-native-client">Benefits of Native Client</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/overview.html#common-use-cases">Common use cases</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/overview.html#how-native-client-works">How Native Client works</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/overview.html#structure-of-a-web-application">Structure of a web application</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/overview.html#where-to-start">Where to start</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="/native-client/quick-start.html">Quick-start</a></li>
 <li class="toctree-l1"><a class="reference internal" href="/native-client/nacl-and-pnacl.html">NaCl and PNaCl</a><ul class="small-gap">
 <li class="toctree-l2"><a class="reference internal" href="/native-client/nacl-and-pnacl.html#native-client-nacl">Native Client (NaCl)</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/nacl-and-pnacl.html#portable-native-client-pnacl">Portable Native Client (PNaCl)</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/nacl-and-pnacl.html#when-to-use-pnacl">When to use PNaCl</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/nacl-and-pnacl.html#when-to-use-nacl">When to use NaCl</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="/native-client/glossary.html">Glossary</a></li>
 <li class="toctree-l1"><a class="reference internal" href="/native-client/sdk/download.html">Download the Native Client SDK</a><ul class="small-gap">
 <li class="toctree-l2"><a class="reference internal" href="/native-client/sdk/download.html#overview">Overview</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/sdk/download.html#prerequisites">Prerequisites</a></li>
-<li class="toctree-l2"><a class="reference internal" href="/native-client/sdk/download.html#versioning">Versioning</a></li>
+<li class="toctree-l2"><a class="reference internal" href="/native-client/sdk/download.html#platforms">Platforms</a></li>
+<li class="toctree-l2"><a class="reference internal" href="/native-client/sdk/download.html#versions">Versions</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/sdk/download.html#installing-the-sdk">Installing the SDK</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/sdk/download.html#updating-bundles">Updating bundles</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/sdk/download.html#help-with-the-naclsdk-utility">Help with the <code>naclsdk</code> utility</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/sdk/download.html#next-steps">Next steps</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="/native-client/sdk/examples.html">Examples</a><ul class="small-gap">
 <li class="toctree-l2"><a class="reference internal" href="/native-client/sdk/examples.html#enable-native-client">Enable Native Client</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/sdk/examples.html#build-the-sdk-examples">Build the SDK examples</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/sdk/examples.html#run-the-sdk-examples">Run the SDK examples</a></li>
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 <li class="toctree-l2"><a class="reference internal" href="/native-client/help.html#forums">Forums</a></li>
 <li class="toctree-l2"><a class="reference internal" href="/native-client/help.html#issue-tracker">Issue tracker</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="/native-client/version.html">SDK version information</a></li>
 </ul>
 </div>
 </section>
 
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