Add missing descriptions about '--timeout' and '--mode' to help

message. They are already implemented in the source code.
Suggestions about the message formatting from Tom Lane.

src/bin/pg_ctl/pg_ctl.c

@@ -1764,7 +1764,7 @@ do_help(void)
 	printf(_("\nCommon options:\n"));
 	printf(_("  -D, --pgdata DATADIR   location of the database storage area\n"));
 	printf(_("  -s, --silent           only print errors, no informational messages\n"));
-	printf(_("  -t SECS                seconds to wait when using -w option\n"));
+	printf(_("  -t, --timeout SECS     seconds to wait when using -w option\n"));
 	printf(_("  -w                     wait until operation completes\n"));
 	printf(_("  -W                     do not wait until operation completes\n"));
 	printf(_("  --help                 show this help, then exit\n"));
@@ -1783,7 +1783,7 @@ do_help(void)
 	 "                         (PostgreSQL server executable) or initdb\n"));
 	printf(_("  -p PATH-TO-POSTGRES    normally not necessary\n"));
 	printf(_("\nOptions for stop or restart:\n"));
-	printf(_("  -m SHUTDOWN-MODE   can be \"smart\", \"fast\", or \"immediate\"\n"));
+	printf(_("  -m, --mode MODE        MODE can be \"smart\", \"fast\", or \"immediate\"\n"));
 
 	printf(_("\nShutdown modes are:\n"));
 	printf(_("  smart       quit after all clients have disconnected\n"));