bug#52179: Highlighting a word in `ispell' using `enchant'

[Eli Zaretskii]

> From: Tor Kringeland <tor.kringeland@ntnu.no>
> CC: "52179@debbugs.gnu.org" <52179@debbugs.gnu.org>
> Date: Fri, 27 May 2022 13:45:14 +0000
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > So we could just modify ispell-find-enchant-dictionaries to always
> > patch the nil entry, like the other two backends do.  Right?
> 
> Yes, it's the easiest way to fix it.  But maybe we should document this
> behavior explicitly?  So if support for some other spell-checker is
> added it's clear that the nil entry requires special attention.

Sure, adding comments for this is fine.