NaCl docs: an update on AVX

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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>
 <p>The dates in the following release notes denote when Chrome and the NaCl SDK
 reached canary status. The stable release is typically 6 weeks later.</p>
 <h2 id="chrome-pepper-42-20-february-2015">Chrome/Pepper 42 (20 February 2015)</h2>
 <h3 id="nacl">NaCl</h3>
 <ul class="small-gap">
-<li>The x86 NaCl validators accept instructions from the FMA3 extensions.</li>
+<li>The x86 NaCl validators accept instructions from the FMA3 extensions, as well
+as AVX2 instructions (except <cite>VGATHER</cite>).</li>
 </ul>
 <h3 id="pnacl">PNaCl</h3>
 <ul class="small-gap">
 <li>PNaCl supports C11/C++11 memory orders <cite>acquire</cite>, <cite>release</cite>, and <cite>acq_rel</cite>. It
 used to upgrade all accesses to <cite>seq_cst</cite>. It still upgrades <cite>consume</cite> to
 <cite>acquire</cite> (no compiler currently implements <cite>consume</cite>), and <cite>relaxed</cite> to
 <cite>seq_cst</cite> (to conservatively avoid platform differences due to out-of-thin-air
 problems).</li>
 <li>PNaCl handles nested struct type expansion, which allows it to better support
 non-C languages such as Rust.</li>
@@ skipping 561 matching lines @@
 </ul>
 <h3 id="id26">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>
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