manuals: Misc macro typos

These were reported by `mandoc -T lint` as
    ERROR: skipping unknown macro
When these pages were rendered with `man`, the "unknown macro" meant
that the entire line was omitted from the output.

Obvious typos in:
lib/libsys/swapon.2
lib/libsys/procctl.2
share/man/man9/firmware.9

lib/libcasper/services/cap_net/cap_net.3: 'mode' describes a function
    argument.

lib/libsys/statfs.2: there's no .Tm command ("trademark?"), and
    .Tn ("tradename") is deprecated, so remove the macro entirely.

usr.sbin/mfiutil/mfiutil.8: man was interpreting '/dev/' as a macro
    (which it didn't recognize).

share/man/man4/qat.4: same issue as above, but with '0'.  In this case,
    given the context of the previous line, rewriting as "Value '0'"
    seemed more appropriate.

usr.sbin/mlx5tool/mlx5tool.8: typo in .Xr

Signed-off-by:	Graham Percival <gperciva@tarsnap.com>
Sponsored by:	Tarsnap Backup Inc.
Reviewed by:	concussious, imp
Pull Request:	https://github.com/freebsd/freebsd-src/pull/1417

lib/libcasper/services/cap_net/cap_net.3

@@ -121,7 +121,7 @@ The
 .Fn cap_net_limit_init
 returns an opaque limit handle used to store a list of capabilities.
 The
-.Fv mode
+.Fa mode
 restricts the functionality of the service.
 Modes are encoded using the following flags:
 .Pp

lib/libsys/procctl.2

@@ -75,7 +75,7 @@ All status changing requests
 .Dv *_CTL
 require the caller to have the right to debug the target.
 All status query requests
-.DV *_STATUS
+.Dv *_STATUS
 require the caller to have the right to observe the target.
 .Pp
 The following commands are supported:

lib/libsys/statfs.2

@@ -231,9 +231,7 @@ Corrupted data was detected while reading from the file system.
 The fields in the
 .Vt statfs
 structure have been defined to provide the parameters relevant for
-traditional
-.Tm UNIX
-file systems.
+traditional UNIX file systems.
 For some other file systems, values that have similar, but not
 identical, semantics to those described above may be returned.
 An example is msdosfs, which in case of FAT12 or FAT16 file systems

lib/libsys/swapon.2

@@ -67,7 +67,7 @@ is made available for other purposes.
 The
 .Fa special
 argument points to the name of the device or file used for swapping.
-.The
+The
 .Va flags
 argument takes the following flags:
 .Bl -tag -width SWAPOFF_FORCE

share/man/man4/qat.4

@@ -148,7 +148,7 @@ QAT firmware revision number.
 Summary of device specific configuration.
 .It Va heartbeat
 QAT device heartbeat status. Value '1' indicates that the device is operational.
-'0' value means that the device is not responsive. Device requires restart.
+Value '0' means that the device is not responsive. Device requires restart.
 .It Va heartbeat_failed
 Number of QAT heartbeat failures received.
 .It Va heartbeat_sent

share/man/man9/firmware.9

@@ -341,7 +341,7 @@ uses the following algorithm to find firmware images:
 .It
 If an existing firmware image is registered for
 .Fa imagename,
-.that image is returned.
+that image is returned.
 .It
 If
 .Fa imagename

usr.sbin/mfiutil/mfiutil.8

@@ -271,7 +271,8 @@ Currently three global options are supported:
 .It Fl D Ar device
 .Ar device
 specifies the device node of the controller to use.
-'/dev/' will be added to the device node if needed.
+.Pa /dev/
+will be added to the device node if needed.
 If no device node is specified,
 then device will be made of the type and device.
 .It Fl t Ar type

usr.sbin/mlx5tool/mlx5tool.8

@@ -60,7 +60,7 @@ The utility executes commands on specific adapter, which is addressed using
 .Em device:bus:slot:function
 conventions of the PCIe buses.
 You can match adapters ethernet name and addresses using the
-.X pciconf 8
+.Xr pciconf 8
 utility.
 The address is passed as an argument of the
 .Fl d