r292558 - Add documentation for constexpr string builtin support.

[Kim Gräsman via cfe-commits]

Hi Richard,

On Fri, Jan 20, 2017 at 1:58 AM, Richard Smith via cfe-commits
<cfe-commits at lists.llvm.org> wrote:
>
> +String builtins
> +---------------
> +
> +Clang provides constant expression evaluation support for builtins forms of
> +the following functions from the C standard library ``<strings.h>`` header:
> +
> +* ``memchr``
> +* ``memcmp``
> +* ``strchr``

This should say ``<string.h>``, right?

- Kim