Fix an incorrect reference to --set-all.

Signed-off-by: Jelmer Vernooij <jelmer@samba.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/config.c

@@ -442,7 +442,7 @@ int cmd_config(int argc, const char **argv, const char *prefix)
 		ret = git_config_set(argv[0], value);
 		if (ret == CONFIG_NOTHING_SET)
 			error("cannot overwrite multiple values with a single value\n"
-			"       Use a regexp, --add or --set-all to change %s.", argv[0]);
+			"       Use a regexp, --add or --replace-all to change %s.", argv[0]);
 		return ret;
 	}
 	else if (actions == ACTION_SET_ALL) {