Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/nacldev.html

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-<section id="nacl-dev-environment">
-<span id="nacldev"></span><h1 id="nacl-dev-environment"><span id="nacldev"></span>NaCl Dev Environment</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="nacl-dev-environment">
+<h1 id="nacl-dev-environment">NaCl Dev Environment</h1>
 <h2 id="feature-status">Feature Status</h2>
 <p>Here is a summary of feature status. We hope to overcome these limitations
 in the near future:</p>
 <blockquote>
 <div><ul class="small-gap">
 <li><p class="first">NaCl Development Environment</p>
 <ul class="small-gap">
 <li><p class="first">General</p>
 <ul class="small-gap">
 <li><p class="first">Supported:</p>
@@ skipping 32 matching lines @@
 <li><p class="first">Debugger</p>
 <ul class="small-gap">
 <li>Open issue causing it to suck CPU cycles (even when not in use).</li>
 </ul>
 </li>
 </ul>
 </div></blockquote>
 </section>
 
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