bug#69983: Use category for display-buffer-alist

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: rudalics@gmx.at,  69983@debbugs.gnu.org
> Date: Fri, 19 Apr 2024 09:28:41 +0300
> 
> > This is not about customizing display-warning.  This is about
> > customizing the display of the warning buffer.  When other
> > functions such as 'lwarn' and 'warn' display the warning buffer
> > the only way to customize the display of the warning buffer
> > is display-buffer-alist.
> 
> Sorry, actually you are right, let's add a new option.
> Will do this soon.

Thank you!