[wwwdocs] Document more C++2a support in libstdc++

[Jonathan Wakely]

On 04/07/18 16:19 -0400, Tim Song wrote:
>On Wed, Jul 4, 2018 at 4:17 PM, Jonathan Wakely <jwakely@redhat.com> wrote:
>> +      <code>std::is_trivially_convertible</code>, and
>
>s/trivially/nothrow/

Oops, thanks - fixed by this patch, also committed.


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