Move 'Versioning' topic from overview to download page.

native_client_sdk/doc_generated/sdk/download.html

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 <section id="download-the-native-client-sdk">
 <span id="download"></span><h1 id="download-the-native-client-sdk"><span id="download"></span>Download the Native Client SDK</h1>
 <p>This page provides an overview of the Native Client SDK, and instructions for
 downloading and installing the SDK.</p>
 <div id="home">
 <a class="button-nacl button-download" href="http://storage.googleapis.com/nativeclient-mirror/nacl/nacl_sdk/nacl_sdk.zip">Download SDK Zip File</a>
 </div><h2 id="overview"><span id="sdk-overview"></span>Overview</h2>
 <p>The Native Client SDK includes:</p>
@@ skipping 29 matching lines @@
 <ul class="small-gap">
 <li>On the Mac, you need to install <code>make</code> on your system before you can build
 and run the examples in the SDK. One easy way to get <code>make</code>, along with
 several other useful tools, is to install <a class="reference external" href="https://developer.apple.com/technologies/tools/">Xcode Developer Tools</a>. After installing Xcode,
 go to the XCode menu, open the Preferences dialog box then select Downloads
 and Components. Verify that Command Line Tools are installed. If you&#8217;d rather
 not install Xcode, you can download and build an <a class="reference external" href="http://mac.softpedia.com/dyn-postdownload.php?p=44632&amp;t=4&amp;i=1">open source version</a> of <code>make</code>.
 To build the program you may also need to download and install <a class="reference external" href="https://github.com/kennethreitz/osx-gcc-installer">gcc</a>.</li>
 <li>On Windows, the Native Client SDK includes a copy of GNU Make.</li>
 </ul>
-<h2 id="installing-the-sdk"><span id="id3"></span>Installing the SDK</h2>
-<h3 id="downloading-and-unzipping"><span id="id4"></span>Downloading and Unzipping</h3>
+<h2 id="versioning"><span id="id3"></span>Versioning</h2>
+<p>Chrome is released on a six week cycle, and developer versions of Chrome are
+pushed to the public beta channel three weeks before each release. As with any
+software, each release of Chrome may include changes to Native Client and the
+Pepper interfaces that may require modification to existing applications.
+However, modules compiled for one version of Pepper/Chrome should work with
+subsequent versions of Pepper/Chrome. The SDK includes multiple versions of the
+Pepper APIs to help developers make adjustments to API changes and take
+advantage of new features: <a class="reference external" href="/native-client/pepper_stable">stable</a>, <a class="reference external" href="/native-client/pepper_beta">beta</a> and <a class="reference external" href="/native-client/pepper_dev">dev</a>.</p>
+<h2 id="installing-the-sdk"><span id="id4"></span>Installing the SDK</h2>
+<h3 id="downloading-and-unzipping"><span id="id5"></span>Downloading and Unzipping</h3>
 <ol class="arabic">
 <li><p class="first">Download the <a class="reference external" href="http://storage.googleapis.com/nativeclient-mirror/nacl/nacl_sdk/nacl_sdk.zip">SDK update zip file</a>.</p>
 </li>
 <li><p class="first">Unzip the file:</p>
 <ul class="small-gap">
 <li><p class="first">On Mac/Linux, run the command <code>unzip nacl_sdk.zip</code> in a terminal
 window.</p>
 </li>
 <li><p class="first">On Windows, right-click on the .zip file and select &#8220;Extract All...&#8221;. A
 dialog box opens; enter a location and click &#8220;Extract&#8221;.</p>
 </li>
 </ul>
 <p>A directory is created called <code>nacl_sdk</code> with the following files and
 directories:</p>
 <ul class="small-gap">
 <li><p class="first"><code>naclsdk</code> (and <code>naclsdk.bat</code> for Windows) &#8212; the update utility,
 which is the command you run to download and update bundles.</p>
 </li>
 <li><p class="first"><code>sdk_cache</code> &#8212; a directory with a manifest file that lists the bundles
 you have already downloaded.</p>
 </li>
 <li><p class="first"><code>sdk_tools</code> &#8212; the code run by the <code>naclsdk</code> command.</p>
 </li>
 </ul>
 </li>
 </ol>
-<h3 id="installing-the-stable-bundle"><span id="id5"></span>Installing the stable bundle</h3>
+<h3 id="installing-the-stable-bundle"><span id="id6"></span>Installing the stable bundle</h3>
 <ol class="arabic">
 <li><p class="first">To see the SDK bundles that are available for download, go to the
 <code>nacl_sdk</code> directory and run <code>naclsdk</code> with the <code>list</code> command. The SDK
 includes a separate bundle for each version of Chrome/Pepper.</p>
 <p>On Mac/Linux:</p>
 <pre class="prettyprint">
 $ cd nacl_sdk
 $ ./naclsdk list
 </pre>
 <p>On Windows:</p>
@@ skipping 43 matching lines @@
 </pre>
 <p>By default, <code>naclsdk</code> only downloads bundles that are recommended,
 generally those that are &#8220;stable.&#8221; For example, if the current &#8220;stable&#8221;
 bundle is <code>pepper_35</code>, then the <code>update</code> downloads that bundle. To
 download the <code>pepper_36</code> bundle you must ask for it explicitly:</p>
 <pre class="prettyprint">
 $ ./naclsdk update pepper_36
 </pre>
 </li>
 </ol>
-<h2 id="updating-bundles"><span id="id6"></span>Updating bundles</h2>
+<h2 id="updating-bundles"><span id="id7"></span>Updating bundles</h2>
 <ol class="arabic">
 <li><p class="first">Run <code>naclsdk</code> with the <code>list</code> command. This shows you the list of available
 bundles and verifies which bundles you have installed.</p>
 <p>On Mac/Linux:</p>
 <pre class="prettyprint">
 $ ./naclsdk list
 </pre>
 <p>On Windows:</p>
 <pre class="prettyprint">
 &gt; naclsdk list
@@ skipping 29 matching lines @@
 <p>On Mac/Linux:</p>
 <pre class="prettyprint">
 $ ./naclsdk update --force
 </pre>
 <p>On Windows:</p>
 <pre class="prettyprint">
 &gt; naclsdk update --force
 </pre>
 </li>
 </ol>
-<h2 id="help-with-the-naclsdk-utility"><span id="id7"></span>Help with the <code>naclsdk</code> utility</h2>
+<h2 id="help-with-the-naclsdk-utility"><span id="id8"></span>Help with the <code>naclsdk</code> utility</h2>
 <ol class="arabic">
 <li><p class="first">For more information about the <code>naclsdk</code> utility, run:</p>
 <p>On Mac/Linux:</p>
 <pre class="prettyprint">
 $ ./naclsdk help
 </pre>
 <p>On Windows:</p>
 <pre class="prettyprint">
 &gt; naclsdk help
 </pre>
 </li>
 </ol>
-<h2 id="next-steps"><span id="id8"></span>Next steps</h2>
+<h2 id="next-steps"><span id="id9"></span>Next steps</h2>
 <ul class="small-gap">
 <li>Browse the <a class="reference external" href="release-notes">Release Notes</a> for important
 information about the SDK and new bundles.</li>
 <li>If you&#8217;re just starting with Native Client, we recommend reading the
 <a class="reference external" href="../overview">Technical Overview</a> and walking through the
 <a class="reference external" href="devguide/tutorial/tutorial-part1">Getting Started Tutorial</a>.</li>
 <li>If you&#8217;d rather dive in, see
 <a class="reference external" href="devguide/devcycle/building">Building Native Client Modules</a>.</li>
 </ul>
 </section>
 
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