smartdns: bump copyright to 2023, and fix some typo

etc/init.d/smartdns

@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright (C) 2018-2020 Ruilin Peng (Nick) <pymumu@gmail.com>.
+# Copyright (C) 2018-2023 Ruilin Peng (Nick) <pymumu@gmail.com>.
 #
 # smartdns is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -93,7 +93,7 @@ case $1 in
 			exit 1
 		fi
 		echo "smartdns server is running."
-		status=$?
+		status=0
 		;;
 	*)
 		echo "Usage: $0 {start|stop|restart|status}"

etc/smartdns/smartdns.conf

@@ -53,7 +53,7 @@ bind [::]:53
 cache-size 32768
 
 # enable persist cache when restart
-# cache-persist yes
+# cache-persist no
 
 # cache persist file
 # cache-file /tmp/smartdns.cache
@@ -168,7 +168,7 @@ log-level info
 # server [IP]:[PORT]|URL [-blacklist-ip] [-whitelist-ip] [-check-edns] [-group [group] ...] [-exclude-default-group]
 # default port is 53
 #   -blacklist-ip: filter result with blacklist ip
-#   -whitelist-ip: filter result whth whitelist ip,  result in whitelist-ip will be accepted.
+#   -whitelist-ip: filter result with whitelist ip,  result in whitelist-ip will be accepted.
 #   -check-edns: result must exist edns RR, or discard result.
 #   -group [group]: set server to group, use with nameserver /domain/group.
 #   -exclude-default-group: exclude this server from default group.
@@ -235,10 +235,12 @@ log-level info
 # ipset /www.example.com/-, ignore this domain
 
 # enable nftset timeout by ttl feature
-# nftset-timeout [yes]
+# nftset-timeout [yes|no]
+# nftset-timeout yes
 
 # enable nftset debug, check nftset setting result, output log when error.
-# nftset-debug [no]
+# nftset-debug [yes|no]
+# nftset-debug yes
 
 # specific nftset to domain
 # nftset /domain/[#4:ip#table#set,#6:ipv6#table#setv6]