[Fontconfig] Wrong Documented Type For FC_LANG?

[Lawrence D'Oliveiro]

On Wed, 29 May 2019 14:56:40 +0900, Akira TAGOH wrote:

> ... you are referring the wrong document for your
> purpose.

My purpose is to develop against the API. That is what the include file
is for, is it not?

> what you should look at is devel doc and that says:
> 
>     lang           FC_LANG                LangSet Set of
> RFC-3066-style languages this font supports
> 
> which is exactly what you want.

The include file should be corrected with that information.