sort.1: tweak formatting of the synopsis.

- Use an ellipsis to signal that the -k option can be repeated.
- Correct a misplaced display of [-t char].

PR standards/59647

Author: jkoshy

usr.bin/sort/sort.1

@@ -1,4 +1,4 @@
-.\"	$NetBSD: sort.1,v 1.45 2026/01/17 20:40:59 uwe Exp $
+.\"	$NetBSD: sort.1,v 1.46 2026/01/17 21:17:23 jkoshy Exp $
 .\"
 .\" Copyright (c) 2000-2003 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -71,7 +71,7 @@
 .Oo
 .Fl k
 .Ar kstart Ns Op Cm \&, Ns Ar kend
-.Oc
+.Oc Ns ...
 .Op Fl o Ar output
 .Op Fl R Ar char
 .Op Fl T Ar dir
@@ -83,9 +83,9 @@
 .Oo
 .Fl k
 .Ar kstart Ns Op Cm \&, Ns Ar kend
-.Op Fl t Ar char
-.Oc
+.Oc Ns ...
 .Op Fl R Ar char
+.Op Fl t Ar char
 .Op Ar
 .Sh DESCRIPTION
 The