[PATCH, doc RFA]: Add guile progspace support

[Eli Zaretskii]

> Date: Fri, 23 May 2014 21:42:36 -0700
> From: Doug Evans <xdje42@gmail.com>
> Cc: "gdb-patches@sourceware.org" <gdb-patches@sourceware.org>
> 
> I wish to point out that the python version says this:
> 
> @defvar Progspace.filename
> The file name of the progspace as a string.
> @end defvar
> 
> I have to say it's a bit disappointing that if there were issues with
> this text that they weren't addressed the first time.

Yes, I'm a disappointing kind of person at times.

You get bonus points for fixing those places as well.

Thanks.