sbp.4: Add a hardware section, fix markup nits

+ tag SPDX
+ add sysctl to apropos database
+ fix markup of examples and reflow a overly long line
+ add a hardware section for hw relnotes

MFC after:	3 days

share/man/man4/sbp.4

@@ -1,3 +1,6 @@
+.\"
+.\" SPDX-License-Identifier: BSD-4-Clause
+.\"
 .\" Copyright (c) 1998-2002 Katsushi Kobayashi and Hidetoshi Shimokawa
 .\" All rights reserved.
 .\"
@@ -29,7 +32,7 @@
 .\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd February 8, 2012
+.Dd November 11, 2025
 .Dt SBP 4
 .Os
 .Sh NAME
@@ -62,19 +65,27 @@ might wonder why the device is not detached at the CAM layer when the device
 is unplugged.
 It is detached only if the device has not been plugged again
 during several bus resets.
-This is for preventing to detach an active file system
-even when the device cannot be probed correctly for some reason after a bus reset
+This is for preventing to detach an active file system even when the
+device cannot be probed correctly for some reason after a bus reset
 or when the device is temporary disconnected because the user changes the bus
 topology.
 If you want to force to detach the device, run
-.Dq Nm fwcontrol Fl r
-several times or set hw.firewire.hold_count=0 by
+.Ql fwcontrol -r
+several times or set
+.Va hw.firewire.hold_count=0
+by
 .Xr sysctl 8 .
 .Pp
 Some (broken) HDDs do not work well with tagged queuing.
 If you have problems with such drives, try
-.Dq Nm camcontrol [device id] tags -N 1
+.Ql camcontrol [device id] tags -N 1
 to disable tagged queuing.
+.Sh HARDWARE
+The
+.Nm
+driver supports FireWire Serial Bus Protocol 2
+.Pq SBP-2
+storage devices.
 .Sh SEE ALSO
 .Xr cam 4 ,
 .Xr firewire 4 ,