[rfa/doc] Add version to XML target descriptions

[Eli Zaretskii]

> Date: Wed, 13 Jun 2007 15:23:12 -0400
> From: Daniel Jacobowitz <drow@false.org>
> Cc: gdb-patches@sourceware.org
> 
> > Yes, but I suggest to give "version" a @code markup here:
> > 
> > > +useful for XML validation tools.  The version attribute for
> 
> Thanks!  I checked it in - I actually used @samp, since there was a
> @samp{<target>} just below.  Let me know if @code would have been
> better, please.

It doesn't matter much, so let's leave it at @samp.