PNaCl documentation: improve some of the SIMD documentation.

native_client_sdk/doc_generated/nacl-and-pnacl.html

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 <section id="nacl-and-pnacl">
 <span id="id1"></span><h1 id="nacl-and-pnacl"><span id="id1"></span>NaCl and PNaCl</h1>
 <p>This document describes the differences between <strong>Native Client</strong> and
 <strong>Portable Native Client</strong>, and provides recommendations for when to use each.</p>
 <div class="contents local" id="contents" style="display: none">
 <ul class="small-gap">
 <li><a class="reference internal" href="#native-client-nacl" id="id3">Native Client (NaCl)</a></li>
 <li><a class="reference internal" href="#portable-native-client-pnacl" id="id4">Portable Native Client (PNaCl)</a></li>
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 conveniences of PNaCl, such as not having to explicitly compile your application
 for all supported architectures.</p>
 </section><section id="when-to-use-nacl">
 <span id="id2"></span><h2 id="when-to-use-nacl"><span id="id2"></span>When to use NaCl</h2>
 <p>The limitations below apply to the current release of PNaCl. If any of
 these limitations are critical for your application, you should use
 non-portable NaCl:</p>
 <ul class="small-gap">
 <li>By its nature, PNaCl does not support architecture-specific
 instructions in an application (i.e., inline assembly), but tries to
-offer high-performance portable equivalents.</li>
+offer high-performance portable equivalents. One such example is
+PNaCl&#8217;s <a class="reference internal" href="/native-client/reference/pnacl-c-cpp-language-support.html#portable-simd-vectors"><em>Portable SIMD Vectors</em></a>.</li>
 <li>Currently PNaCl only supports static linking with the <code>newlib</code>
 C standard library (the Native Client SDK provides a PNaCl port of
 <code>newlib</code>). Dynamic linking and <code>glibc</code> are not yet supported.
 Work is under way to enable dynamic linking in future versions of PNaCl.</li>
 <li>In the initial release, PNaCl does not support some GNU extensions
 like taking the address of a label for computed <code>goto</code>, or nested
 functions.</li>
 </ul>
 </section></section>
 
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