Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/devguide/coding/audio.html

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-<section id="audio">
-<span id="devguide-coding-audio"></span><h1 id="audio"><span id="devguide-coding-audio"></span>Audio</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="audio">
+<h1 id="audio">Audio</h1>
 <div class="contents local" id="contents" style="display: none">
 <ul class="small-gap">
 <li><a class="reference internal" href="#reference-information" id="id1">Reference information</a></li>
 <li><a class="reference internal" href="#about-the-pepper-audio-api" id="id2">About the Pepper audio API</a></li>
 <li><a class="reference internal" href="#digital-audio-concepts" id="id3">Digital audio concepts</a></li>
 <li><a class="reference internal" href="#setting-up-the-module" id="id4">Setting up the module</a></li>
 <li><p class="first"><a class="reference internal" href="#creating-an-audio-configuration-resource" id="id5">Creating an audio configuration resource</a></p>
 <ul class="small-gap">
 <li><a class="reference internal" href="#resources" id="id6">Resources</a></li>
 <li><a class="reference internal" href="#sample-frame-count" id="id7">Sample frame count</a></li>
@@ skipping 316 matching lines @@
   } else if (message == kStopSoundId) {
     audio_.StopPlayback();
   } else if (...) {
     ...
   }
 }
 </pre>
 </section>
 
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