Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/reference/design-docs.html

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-<section id="design-documents">
+<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="design-documents">
 <h1 id="design-documents">Design Documents</h1>
 <p>This is a list of design documents for Native Client.  This list
 generally covers designs that were implemented.  It does not cover
 PPAPI (Pepper).</p>
 <p>Dynamic loading and linking:</p>
 <ul class="small-gap">
 <li><a class="reference external" href="http://code.google.com/p/nativeclient/wiki/DynamicLoadingOptions">Dynamic loading: Options for supporting dynamic loading, and how they interact with dynamic libraries</a> (2010)</li>
 </ul>
 <p>Handling faults (hardware exceptions) in untrusted code:</p>
 <ul class="small-gap">
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 </ul>
 <h2 id="obsolete-not-implemented">Obsolete (not implemented)</h2>
 <p>PNaCl multi-threading support:  The following proposals do not reflect what was implemented in PNaCl in the end.  They are listed here for historical reference.</p>
 <ul class="small-gap">
 <li><a class="reference external" href="https://docs.google.com/a/chromium.org/document/d/1HcRiGOaaPLk7pQrGnjXceoM7Px3IwOjjwdiVvJVQNr4/edit">Multi-threading support for a first release of PNaCl</a> (2013): Proposal for mutex_v2/cond_v2 IRT interfaces.</li>
 <li><a class="reference external" href="https://docs.google.com/a/chromium.org/document/d/1HcRiGOaaPLk7pQrGnjXceoM7Px3IwOjjwdiVvJVQNr4/edit">Explicit vs. implicit atomicity guarantees in PNaCl</a> (2013): Discussion about how to handle atomic memory operations.</li>
 </ul>
 </section>
 
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