[wwwdocs] Mention libstdc++-v3 <regex> in 4.9 changes.html

[Tim Shen]

I feel little bit uncomfortable with "new ISO C++ standard, C++11",
since C++14 is already there, so I removed it.

Please check the words, since English is not my first language >.<

Thanks!


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> <dt><span><a href="projects/cxx0x.html">C++11</a> <regex> support</span>
>     <span class="date">[2013-10-02]</span></dt>
> <dd>Regular expression support in <a href="libstdc++/">libstdc++-v3</a> is now available.</dd>
>

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>     <li><a href="http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2011">
>        Improved support for C++11</a>, including support for <regex>.
>     </li>


-- 
Tim Shen