ahc.4,ahd.4: Improve HARDWARE + tag SPDX

Add some context for the Hardware Relnotes, and tag SPDX while here.

MFC after:	3 days

share/man/man4/ahc.4

@@ -1,4 +1,6 @@
 .\"
+.\" SPDX-License-Identifier: BSD-3-Clause
+.\"
 .\" Copyright (c) 1995, 1996, 1997, 1998, 2000
 .\" 	Justin T. Gibbs.  All rights reserved.
 .\"
@@ -24,7 +26,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd February 15, 2017
+.Dd September 29, 2025
 .Dt AHC 4
 .Os
 .Sh NAME
@@ -172,11 +174,7 @@ adapter, defaults to enabled (0 -- disabled, 1 -- enabled).
 .Sh HARDWARE
 The
 .Nm
-driver supports the following
-.Tn SCSI
-host adapter chips and
-.Tn SCSI
-controller cards:
+driver supports the following VL/ISA/PCI parallel SCSI controllers and cards:
 .Pp
 .Bl -bullet -compact
 .It

share/man/man4/ahd.4

@@ -1,4 +1,6 @@
 .\"
+.\" SPDX-License-Identifer: BSD-3-Clause
+.\"
 .\" Copyright (c) 1995, 1996, 1997, 1998, 2000
 .\" 	Justin T. Gibbs.  All rights reserved.
 .\" Copyright (c) 2002
@@ -26,7 +28,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd July 4, 2004
+.Dd September 29, 2025
 .Dt AHD 4
 .Os
 .Sh NAME
@@ -132,7 +134,7 @@ A hint to define whether the SCSI target mode is enabled (0 -- disabled, 1 -- en
 .Sh HARDWARE
 The
 .Nm
-driver supports the following:
+driver supports the following PCI/PCI-X parallel SCSI controllers:
 .Pp
 .Bl -bullet -compact
 .It