Add manual page for abl(4).

ok kettenis@

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+.\"	$OpenBSD: abl.4,v 1.1 2020/09/15 18:38:51 mglocker Exp $
+.\"
+.\" Copyright (c) 2020 Marcus Glocker <mglocker@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.\"
+.Dd $Mdocdate: September 15 2020 $
+.Dt ABL 4
+.Os
+.Sh NAME
+.Nm abl
+.Nd Apple backlight support
+.Sh SYNOPSIS
+.Cd "abl* at acpi?"
+.Sh DESCRIPTION
+The
+.Nm
+driver enables access to the backlight found in Intel based Apple computers.
+It allows to control the brightness using the
+.Xr wsconsctl 8
+variable
+.Dq display.brightness .
+.Sh SEE ALSO
+.Xr acpi 4 ,
+.Xr intro 4 ,
+.Xr wsconsctl 8
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 6.8 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Marcus Glocker Aq Mt mglocker@openbsd.org .