bug#41544: 26.3; Possible incorrect results from color-distance

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: mattiase@acm.org,  simenheg@runbox.com,  tom@tromey.com,
>   41544@debbugs.gnu.org
> Date: Wed, 19 Aug 2020 12:13:00 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I think it is.  Think about what you'd say in the doc string of such a
> > defcustom.  "If non-nil, handle colors correctly, otherwise handle
> > them incorrectly"?
> 
> It's probably say "If non-nil, use old-style computation".

Is that a useful doc string?