newfs_msdos.8: Add example for specific cluster size

sbin/newfs_msdos/newfs_msdos.8

@@ -23,7 +23,7 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 .\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd June 14, 2018
+.Dd January 12, 2024
 .Dt NEWFS_MSDOS 8
 .Os
 .Sh NAME
@@ -224,6 +224,12 @@ Create a file system, using default parameters, on
 newfs_msdos /dev/ada0s1
 .Ed
 .Pp
+Create a FAT32 filesystem with a 32kb allocation size on
+.Pa /dev/mmcsd0s1 :
+.Bd -literal -offset indent
+newfs_msdos -F32 -A -c 64 /dev/mmcsd0s1
+.Ed
+.Pp
 Create a standard 1.44M file system, with volume label
 .Ar foo ,
 on