pg_ctl: Add promote wait option to help output

pointed out by Masahiko Sawada <sawada.mshk@gmail.com>

src/bin/pg_ctl/pg_ctl.c

@@ -1943,7 +1943,7 @@ do_help(void)
 			 "                 [-o \"OPTIONS\"]\n"), progname);
 	printf(_("  %s reload                 [-D DATADIR] [-s]\n"), progname);
 	printf(_("  %s status                 [-D DATADIR]\n"), progname);
-	printf(_("  %s promote [-D DATADIR] [-s]\n"), progname);
+	printf(_("  %s promote [-w] [-t SECS] [-D DATADIR] [-s]\n"), progname);
 	printf(_("  %s kill    SIGNALNAME PID\n"), progname);
 #ifdef WIN32
 	printf(_("  %s register   [-N SERVICENAME] [-U USERNAME] [-P PASSWORD] [-D DATADIR]\n"