[PATCH wayland] util: Document wl_array and wl_list members

[Daniel Stone]

Hi Yong,

On 6 December 2016 at 15:21, Yong Bakos <junk at humanoriented.com> wrote:
> Despite their clear names, wl_array and wl_list members are undocumented,
> resulting in doxygen warnings[1] when building documentation.
>
> Document these members, suppressing the warnings.

Not a difficult review; pushed.

Cheers,
Daniel