Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/devguide/tutorial/tutorial-part1.html

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-<section id="c-tutorial-getting-started-part-1">
-<span id="tutorial"></span><h1 id="c-tutorial-getting-started-part-1"><span id="tutorial"></span>C++ Tutorial: Getting Started (Part 1)</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="c-tutorial-getting-started-part-1">
+<h1 id="c-tutorial-getting-started-part-1">C++ Tutorial: Getting Started (Part 1)</h1>
 <div class="contents local" id="contents" style="display: none">
 <ul class="small-gap">
 <li><p class="first"><a class="reference internal" href="#overview" id="id1">Overview</a></p>
 <ul class="small-gap">
 <li><a class="reference internal" href="#what-the-application-in-this-tutorial-does" id="id2">What the application in this tutorial does</a></li>
 <li><a class="reference internal" href="#communication-between-javascript-and-native-client-modules" id="id3">Communication between JavaScript and Native Client modules</a></li>
 </ul>
 </li>
 <li><a class="reference internal" href="#step-1-download-and-install-the-native-client-sdk" id="id4">Step 1: Download and install the Native Client SDK</a></li>
 <li><a class="reference internal" href="#step-2-start-a-local-server" id="id5">Step 2: Start a local server</a></li>
@@ skipping 216 matching lines @@
 <li>See the <a class="reference internal" href="/native-client/devguide/devcycle/building.html"><em>Building</em></a>, <a class="reference internal" href="/native-client/devguide/devcycle/running.html"><em>Running</em></a>, and <a class="reference internal" href="/native-client/devguide/devcycle/debugging.html"><em>Debugging pages</em></a> for information about how to build, run, and
 debug Native Client applications.</li>
 <li>Check the <a class="reference external" href="https://chromium.googlesource.com/webports">webports</a> project to
 see what libraries have been ported for use with Native Client. If you port an
 open-source library for your own use, we recommend adding it to webports
 (see <a class="reference external" href="https://chromium.googlesource.com/webports/+/master/CONTRIBUTING.md">How to check code into webports</a>).</li>
 </ul>
 </section>
 
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