cam: Cross-reference dtrace_cam.4 and cam.4

While here, remove empty sections from cam.4.

MFC after:	3 days
Fixes:		1a7151f796 cam: Add probes for xpt actions

share/man/man4/dtrace_cam.4

@@ -2,7 +2,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.Dd December 26, 2025
+.Dd May 7, 2026
 .Dt DTRACE_CAM 4
 .Os
 .Sh NAME
@@ -25,11 +25,9 @@ probe fires when that request completes.
 The
 .Fn cam::xpt:async-cb
 probe fires just before an async callback is called.
-.Sh ARGUMENTS
-.Sh FILES
-.Sh EXAMPLES
 .Sh SEE ALSO
 .Xr dtrace 1 ,
+.Xr cam 4 ,
 .Xr SDT 9
 .Sh HISTORY
 The

share/man/man4/scsi.4

@@ -22,7 +22,7 @@
 .\" LIABILITY, OR TORT (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 December 11, 2025
+.Dd May 7, 2026
 .Dt CAM 4
 .Os
 .Sh NAME
@@ -530,6 +530,8 @@ for details.
 .\" .Xr ps3cdrom 4 ,
 .Xr sbp 4 ,
 .Xr twa 4
+.It Sy DTrace Providers:
+.Xr dtrace_cam 4
 .El
 .Sh HISTORY
 The