[RFA] Document fixed/floating variable objects and thread-id.

[Eli Zaretskii]

> From:  Vladimir Prus <vladimir@codesourcery.com>
> Date:  Sat, 26 Apr 2008 21:16:01 +0400
> 
> > More to the point, I cannot say that I have a clear understanding of
> > the issue.  In what other situations will fixed and floating varobjs
> > behave differently?  Are we talking about any situation where
> > identically named variables have different binding to memory
> > addresses, depending on scope and context?  
> 
> Yes.

Okay, thanks for explaining this to me.  Based on what you wrote, I
suggest to say ``the values of variables whose names appear in the
expressions are re-evaluated every time in the context of the current
frame.''  Adding a couple of examples might explain this even further.