Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/glossary.html

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-<section id="glossary">
-<span id="id1"></span><h1 id="glossary"><span id="id1"></span>Glossary</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="id1">
+<h1 id="id1">Glossary</h1>
 <p>This glossary defines terms and names commonly used throughout the Native Client
 documentation.</p>
 <dl class="docutils">
 <dt>asynchronous programming</dt>
 <dd>In the asynchronous programming model, function calls are executed and return
 immediately without waiting for a response. Using this model, function calls
 are non-blocking; the web browser continues its main thread of execution
 and gets notified of asynchronous call completion through callbacks or some
 other mechanism.</dd>
 <dt>focus events</dt>
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 <dd><a class="reference external" href="http://en.wikipedia.org/wiki/Web_Workers">Web workers</a> provide a
 mechanism for running heavy-weight JavaScript code on background threads
 so that the main web page can continue to respond to user interaction.
 Web pages interact with web workers by using <code>postMessage()</code> to send
 messages. The way a web page interacts with a Native Client module
 is analogous to the way it interacts with web workers.</dd>
 </dl>
 </section>
 
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