[wiki, PATCH] Correct description of coarray support and remove some items from the unsupported list

[Janus Weil]

Hi Andre,

> I tried to update:
>
> https://gcc.gnu.org/wiki/Fortran2008Status
>
> but am not allowed to.

in order to edit the wiki you need to be listed at:
https://gcc.gnu.org/wiki/EditorGroup

If you tell me your username for the wiki, I'll add you ...

Cheers,
Janus