Document -e flag.

PR:		docs/14936
Submitted by:	Stephen J. Roznowski <sjr@home.com>

usr.bin/chpass/chpass.1

@@ -47,8 +47,19 @@
 .Nm chpass
 .Op Fl a Ar list
 .Op Fl p Ar encpass
+.Op Fl e Ar expiretime
 .Op Fl s Ar newshell
 .Op user
+.Pp
+.Nm chpass
+.Op Fl oly
+.Op Fl a Ar list
+.Op Fl p Ar encpass
+.Op Fl e Ar expiretime
+.Op Fl s Ar newshell
+.Op Fl d Ar domain
+.Op Fl h Ar host
+.Op user
 .Sh DESCRIPTION
 The
 .Nm
@@ -77,6 +88,9 @@ The super-user is allowed to directly supply an encrypted password field,
 in the format used by
 .Xr crypt 3 ,
 as an argument.
+.It Fl e Ar expiretime
+Change the account expire time. This option is used to set the expire time
+from a script as if it was done in the interactive editor.
 .It Fl s Ar newshell
 Attempt to change the user's shell to
 .Ar newshell .