Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/devguide/tutorial/tutorial-part2.html

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-<section id="c-tutorial-getting-started-part-2">
-<span id="tutorial2"></span><h1 id="c-tutorial-getting-started-part-2"><span id="tutorial2"></span>C++ Tutorial: Getting Started (Part 2)</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-2">
+<h1 id="c-tutorial-getting-started-part-2">C++ Tutorial: Getting Started (Part 2)</h1>
 <div class="contents local" id="contents" style="display: none">
 <ul class="small-gap">
 <li><a class="reference internal" href="#overview" id="id1">Overview</a></li>
 <li><p class="first"><a class="reference internal" href="#using-the-native-client-sdk-build-system" id="id2">Using the Native Client SDK build system</a></p>
 <ul class="small-gap">
 <li><a class="reference internal" href="#simplifying-the-makefile" id="id3">Simplifying the Makefile</a></li>
 <li><a class="reference internal" href="#choosing-valid-toolchains-and-including-common-mk" id="id4">Choosing valid toolchains, and including common.mk</a></li>
 <li><a class="reference internal" href="#configuring-your-project" id="id5">Configuring your project</a></li>
 <li><a class="reference internal" href="#build-macros" id="id6">Build macros</a></li>
 </ul>
@@ skipping 419 matching lines @@
 </li>
 <li><p class="first">Re-run the application by reloading <code>http://localhost:5103/part2</code> in
 Chrome.</p>
 <p>After Chrome loads the Native Client module, you should see the message sent
 from the module.</p>
 </li>
 </ol>
 </section>
 
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