bug#52018: 28.0.60; Improve documentation for compilation-finish-functions

[Eli Zaretskii]

> From: Thibault Polge <thibault@thb.lt>
> Cc: 52018@debbugs.gnu.org
> Date: Tue, 23 Nov 2021 10:26:50 +0100
> 
> > If the purpose is to provide the exit status to the function, we need
> > to take care to pass it without any massaging.  We don't make a point
> > of doing that now, so I'd prefer not to document this in such certain
> > terms, as people will then complain that it isn't 100% accurate.
> 
> Thanks for the clarification. This makes sense, I'm just not sure how to
> act on this.  Would you rather drop this change or modify it to use more
> cautious language?  

Not sure, actually.  Lars, WDYT?