Integrate FreeBSD r335189 for -A option.

Bug: 110053628
Change-Id: Ic59054c7e13849b392971746cdaa901f11552fca
diff --git a/newfs_msdos.8 b/newfs_msdos.8
index 61639f5..10ec59b 100644
--- a/newfs_msdos.8
+++ b/newfs_msdos.8
@@ -23,9 +23,9 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 .\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $FreeBSD: head/sbin/newfs_msdos/newfs_msdos.8 318366 2017-05-16 19:03:26Z emaste $
+.\" $FreeBSD: head/sbin/newfs_msdos/newfs_msdos.8 335189 2018-06-15 06:03:40Z delphij $
 .\"
-.Dd May 16, 2017
+.Dd June 14, 2018
 .Dt NEWFS_MSDOS 8
 .Os
 .Sh NAME
@@ -35,6 +35,7 @@
 .Nm
 .Op Fl N
 .Op Fl @ Ar offset
+.Op Fl A
 .Op Fl B Ar boot
 .Op Fl C Ar create-size
 .Op Fl F Ar FAT-type
@@ -91,6 +92,8 @@
 A suffix s, k, m, g (lower or upper case)
 appended to the offset specifies that the
 number is in sectors, kilobytes, megabytes or gigabytes, respectively.
+.It Fl A
+Attempt to cluster align root directory, useful for SD card.
 .It Fl B Ar boot
 Get bootstrap from file.
 .It Fl C Ar create-size