[NaCl SDK] rename nacl_io demo.

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 <section id="building">
 <span id="devcycle-building"></span><h1 id="building"><span id="devcycle-building"></span>Building</h1>
 <div class="contents local" id="table-of-contents" style="display: none">
 <p class="topic-title first">Table Of Contents</p>
 <ul class="small-gap">
 <li><p class="first"><a class="reference internal" href="#introduction" id="id4">Introduction</a></p>
 <ul class="small-gap">
 <li><a class="reference internal" href="#target-architectures" id="id5">Target architectures</a></li>
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 <dt>libppapi_gles2.a</dt>
 <dd>Implements the Pepper (PPAPI) GLES interface. Needed by applications
 that use the 3D graphics API.</dd>
 <dt>libnacl_io.a</dt>
 <dd>Provides a POSIX layer for NaCl. In particular, the library provides a
 virtual file system and support for sockets. The virtual file system
 allows a module to &#8220;mount&#8221; a given directory tree. Once a module has
 mounted a file system, it can use standard C library file operations:
 <code>fopen</code>, <code>fread</code>, <code>fwrite</code>, <code>fseek</code>, and <code>fclose</code>.
 For more detail, see the header <code>include/nacl_io/nacl_io.h</code>.
-For an example of how to use nacl_io, see <code>examples/demo/nacl_io</code>.</dd>
+For an example of how to use nacl_io, see <code>examples/demo/nacl_io_demo</code>.</dd>
 <dt>libppapi_simple.a</dt>
 <dd>Provides a familiar C programming environment by letting a module have a
 simple entry point that is registered by <code>PPAPI_SIMPLE_REGISTER_MAIN</code>.
 The entry point is similar to the standard C <code>main()</code> function, complete
 with <code>argc</code> and <code>argv[]</code> parameters. For details see
 <code>include/ppapi_simple/ps.h</code>. For an example of
 how to use ppapi_simple, <code>see examples/tutorial/using_ppapi_simple</code>.</dd>
 </dl>
 <aside class="note">
 <ul class="small-gap">
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 Function foo has disallowed type: i128 (i128)
 LLVM ERROR: PNaCl ABI verification failed
 </pre>
 <p>When faced with a PNaCl ABI verification error, check the list of features
 that are <a class="reference internal" href="/native-client/nacl-and-pnacl.html#when-to-use-nacl"><em>not supported by PNaCl</em></a>.
 If the problem you face is not listed as restricted,
 <a class="reference internal" href="/native-client/help.html#help"><em>let us know</em></a>!</p>
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