Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/devguide/distributing.html

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-<section id="distributing-your-application">
-<span id="distributing"></span><h1 id="distributing-your-application"><span id="distributing"></span>Distributing Your Application</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="distributing-your-application">
+<h1 id="distributing-your-application">Distributing Your Application</h1>
 <div class="contents local" id="contents" style="display: none">
 <ul class="small-gap">
 <li><a class="reference internal" href="#portable-native-client" id="id2">Portable Native Client</a></li>
 <li><p class="first"><a class="reference internal" href="#non-portable-native-client" id="id3">Non-portable Native Client</a></p>
 <ul class="small-gap">
 <li><a class="reference internal" href="#chrome-apps" id="id4">Chrome apps</a></li>
 <li><a class="reference internal" href="#extension" id="id5">Extension</a></li>
 <li><a class="reference internal" href="#hosted-application" id="id6">Hosted application</a></li>
 <li><a class="reference internal" href="#registering-native-client-modules-to-handle-mime-types" id="id7">Registering Native Client modules to handle MIME types</a></li>
 </ul>
@@ skipping 287 matching lines @@
       &quot;mime_type&quot;: &quot;application/vnd.oasis.opendocument.text&quot;
    }]
 }
 </pre>
 <p>The <code>nacl_modules</code> attribute is optional&#8212;specify this attribute only if
 you want Chrome to use a Native Client module to display a particular type of
 content.</p>
 </section>
 
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