Add example usage for formatting a floppy disk. Adding a more self

contained example here in the fdformat man page will allow us to
modernize and streamline the FreeBSD Handbook by cutting out some of
this legacy material.

While here, address some other minor grammatical nits in this man page.

Reviewed by:	bcr (mentor)
Approved by:	bcr (mentor)
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D24971

usr.sbin/fdformat/fdformat.8

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd December 4, 2017
+.Dd May 23, 2020
 .Dt FDFORMAT 8
 .Os
 .Sh NAME
@@ -46,12 +46,12 @@ where
 .Ar device
 may either be given as a full path
 name of a device node for a floppy disk drive
-(e.g.\&
+(e.g.,\&
 .Pa /dev/fd0 ) ,
 or using an abbreviated name that will be looked up
 under
 .Pa /dev
-(e.g.\&
+(e.g.,\&
 .Dq Li fd0 ) .
 .Pp
 The options are as follows:
@@ -133,6 +133,30 @@ Exit status
 1 is returned on any errors during floppy formatting, and an exit status
 of 2 reflects invalid arguments given to the program (along with an
 appropriate information written to diagnostic output).
+.Sh EXAMPLES
+To format a new double-sided, high-density (HD) 1.44 MB disk
+inserted in the first floppy disk drive, issue:
+.Pp
+.Dl "/usr/sbin/fdformat -f 1440 /dev/fd0"
+.Pp
+After low-level formatting the disk with
+.Nm ,
+create a disk label so that the system can determine the size and
+geometry of the disk.
+The supported geometry values are listed in
+.Pa /etc/disktab ,
+and we will use
+.Va fd1440
+for this example.
+To write the disk label, use
+.Xr bsdlabel 8 :
+.Pp
+.Dl "/sbin/bsdlabel -B -w /dev/fd0 fd1440"
+.Pp
+The floppy is now ready to be high-level formatted with a file system.
+To format the floppy disk with FAT, issue:
+.Pp
+.Dl "/sbin/newfs_msdos /dev/fd0"
 .Sh DIAGNOSTICS
 Unless
 .Fl q
@@ -150,6 +174,7 @@ exact cause of the error) will be printed for up to 10 errors after the
 entire formatting process has completed.
 .Sh SEE ALSO
 .Xr fdc 4 ,
+.Xr bsdlabel 8 ,
 .Xr fdcontrol 8 ,
 .Xr newfs 8 ,
 .Xr newfs_msdos 8