Add another badly-needed simple example to the pw(8) man page.

svn path=/head/; revision=305758

usr.sbin/pw/pw.8

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd April 23, 2016
+.Dd September 12, 2016
 .Dt PW 8
 .Os
 .Sh NAME
@@ -966,6 +966,11 @@ Finally, a random password is generated and displayed:
 .Bd -literal -offset indent
 pw useradd -n gsmith -c "Glurmo Smith" -s /bin/csh -m -w random
 .Ed
+.Pp
+Delete the gsmith user and their home directory, including contents.
+.Bd -literal -offset indent
+pw userdel -n gsmith -r
+.Ed
 .Sh EXIT STATUS
 The
 .Nm