Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/devguide/devcycle/vs-addin.html

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-<section id="debugging-with-visual-studio">
-<span id="devcycle-vs-addin"></span><h1 id="debugging-with-visual-studio"><span id="devcycle-vs-addin"></span>Debugging with Visual Studio</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="debugging-with-visual-studio">
+<h1 id="debugging-with-visual-studio">Debugging with Visual Studio</h1>
 <div class="contents local" id="table-of-contents" style="display: none">
 <p class="topic-title first">Table Of Contents</p>
 <ul class="small-gap">
 <li><a class="reference internal" href="#introduction" id="id1">Introduction</a></li>
 <li><p class="first"><a class="reference internal" href="#platforms" id="id2">Platforms</a></p>
 <ul class="small-gap">
 <li><a class="reference internal" href="#the-ppapi-platform" id="id3">The PPAPI platform</a></li>
 <li><a class="reference internal" href="#the-native-client-platforms" id="id4">The Native Client platforms</a></li>
 </ul>
 </li>
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 </dl>
 <h4 id="nacl64-platform">NaCl64 Platform</h4>
 <dl class="docutils">
 <dt>Run the Native Client Module in the NaCl64 platform</dt>
 <dd>You are still running the STEP6 code, but as a Native Client module rather
 than a Pepper plugin.</dd>
 </dl>
 </section>
 
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