bsdinstall.8: Minor maintenance

Replace CD-ROMs with "discs, USBs, or network boot environments"
to both modernize aesthetic and also nudge youths to think at scale.
Since I'm disrupting the flow of these lines anyway, expand the VM
acronym because I think this is one of the first manuals people will
be looking at.

Reset list alignment to seven characters. It was at 19 characters,
and that was not enough to align them all, wasting many extra lines
by crunching all the words over. Seven actually bought us some lines
from six due to avg item size. Tag SPDX.

MFC after:	3 days
Discussed with:	ivy, zi

1 files changed, 11 insertions, 8 deletions

diff --git a/usr.sbin/bsdinstall/bsdinstall.8 b/usr.sbin/bsdinstall/bsdinstall.8
index 527250d380d1..6175d26b4fd3 100644
--- a/usr.sbin/bsdinstall/bsdinstall.8
+++ b/usr.sbin/bsdinstall/bsdinstall.8
@@ -1,4 +1,6 @@
-.\"-
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
 .\" Copyright (c) 2011-2013 Nathan Whitehorn <nwhitehorn@FreeBSD.org> All rights reserved.
 .\" Copyright (c) 2018 Roberto Fernandez Cueto <roberfern@gmail.com>
 .\" Copyright (c) 2024 The FreeBSD Foundation
@@ -27,7 +29,7 @@
 .\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd November 4, 2024
+.Dd October 3, 2025
 .Dt BSDINSTALL 8
 .Os
 .Sh NAME
@@ -40,9 +42,10 @@
 .Op Ar ...
 .Sh DESCRIPTION
 .Nm
-is used for installation of new systems, both for system setup from
-installation media, e.g., CD-ROMs, and for use on live systems to prepare
-VM images and jails.
+is used for installation of new systems,
+both for system setup from installation media,
+such as discs, USBs, or network boot environments,
+and for use on live systems to prepare jails and virtual machine images.
 .Pp
 Much like
 .Xr make 1 , Nm
@@ -56,7 +59,7 @@ these subtargets can be invoked separately by an installation script.
 .Sh OPTIONS
 .Nm
 supports the following options, global to all targets:
-.Bl -tag -width indent+
+.Bl -tag -width "-D file"
 .It Fl D Ar file
 Provide a path for the installation log file
 .Pq overrides Ev BSDINSTALL_LOG .
@@ -73,7 +76,7 @@ For interactive use, most users will be interested only in the
 and
 .Cm script
 targets.
-.Bl -tag -width "jail destination"
+.Bl -tag -width "-D file"
 .It Cm auto
 Run the standard interactive installation, including disk partitioning.
 .It Cm jail Ar destination
@@ -295,7 +298,7 @@ Many are used internally during installation and have reasonable default values
 for most installation scenarios.
 Others are set by various interactive user prompts, and can be usefully
 overridden when making scripted or customized installers.
-.Bl -tag -width "BSDINSTALL_DISTSITE"
+.Bl -tag -width "-D file"
 .It Ev TMPDIR
 The directory to use for temporary files.
 Default: