PNaCl documentation: improve some of the SIMD documentation.

native_client_sdk/doc_generated/sdk/release-notes.html

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 <section id="release-notes">
 <span id="sdk-release-notes"></span><h1 id="release-notes"><span id="sdk-release-notes"></span>Release Notes</h1>
 <section id="chrome-pepper-36-09-may-2014">
 <h2 id="chrome-pepper-36-09-may-2014">Chrome/Pepper 36 (09 May 2014)</h2>
 <section id="pnacl">
 <h3 id="pnacl">PNaCl</h3>
 <ul class="small-gap">
 <li>Support <a class="reference external" href="http://clang.llvm.org/docs/LanguageExtensions.html#vectors-and-extended-vectors">LLVM vectors</a>
 and <a class="reference external" href="http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html">GCC vectors</a> for SIMD
-vectors.</li>
+vectors through <a class="reference internal" href="/native-client/reference/pnacl-c-cpp-language-support.html#portable-simd-vectors"><em>Portable SIMD Vectors</em></a>. Note that this is still an early release,
+and performance is expected to become acceptable for version 37 of
+Chrome. More SIMD instructions will be added in later releases.</li>
 </ul>
 </section></section><section id="chrome-pepper-35-31-mar-2014">
 <h2 id="chrome-pepper-35-31-mar-2014">Chrome/Pepper 35 (31 Mar 2014)</h2>
 <section id="id1">
 <h3 id="id1">PNaCl</h3>
 <ul class="small-gap">
 <li>Upgraded LLVM to version 3.4.</li>
 <li>Translation now uses dynamic load balancing, making translation time faster.</li>
 <li>Unstable pexes (i.e. non-finalized) with debug information can be loaded by
 Chrome, simplifying debugging with PNaCl. See <a class="reference internal" href="/native-client/devguide/devcycle/debugging.html#debugging-pnacl-pexes"><em>Debugging PNaCl pexes</em></a></li>
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 </section><section id="id18">
 <h3 id="id18">PPAPI</h3>
 <ul class="small-gap">
 <li>The <code>CompletionCallbackFactory</code> class template now takes a thread traits
 class as its second parameter. For details see the <a class="reference external" href="/native-client/pepper_stable/cpp/classpp_1_1_completion_callback_factory#details">CompletionCallbackFactory
 class template reference</a>.</li>
 </ul>
 </section></section></section>
 
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