bug#8119: 24.0.50; `mark-active' needs its doc string

[Eli Zaretskii]

> Date: Fri, 25 Feb 2011 17:38:32 -0500
> From: Glenn Morris <rgm@gnu.org>
> Cc: 
> 
> retitle 8119 buggy 2011-02-14 trunk build on MS Windows
> stop
> 
> > Emacs 24:
> > "Not documented as a variable."
> 
> s/Emacs 24/current trunk/
> 
> Anyway, buggy build. 
> 
> Current trunk on GNU/Linux:
>     
>     mark-active is a variable defined in `C source code'.
>     Its value is nil
>     Local in buffer *scratch*; global value is nil
>     
>       Automatically becomes buffer-local when set in any fashion.
>     
>     Documentation:
>     Non-nil means the mark and region are currently active in this buffer.

Confirmed, I see the same as Glenn with yesterday's build of the trunk
on Windows.