pg_ctl: Improve --help output

All other --help output has = signs between long options and their
arguments, so do it here as well.

src/bin/pg_ctl/pg_ctl.c

@@ -1762,9 +1762,9 @@ do_help(void)
 #endif
 
 	printf(_("\nCommon options:\n"));
-	printf(_("  -D, --pgdata DATADIR   location of the database storage area\n"));
+	printf(_("  -D, --pgdata=DATADIR   location of the database storage area\n"));
 	printf(_("  -s, --silent           only print errors, no informational messages\n"));
-	printf(_("  -t, --timeout 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"));
@@ -1778,12 +1778,12 @@ do_help(void)
 #else
 	printf(_("  -c, --core-files       not applicable on this platform\n"));
 #endif
-	printf(_("  -l, --log FILENAME     write (or append) server log to FILENAME\n"));
+	printf(_("  -l, --log=FILENAME     write (or append) server log to FILENAME\n"));
 	printf(_("  -o OPTIONS             command line options to pass to postgres\n"
 	 "                         (PostgreSQL server executable) or initdb\n"));
 	printf(_("  -p PATH-TO-POSTGRES    normally not necessary\n"));
 	printf(_("\nOptions for stop or restart:\n"));
-	printf(_("  -m, --mode MODE        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"));