Update dnspod.ini document address

resolve #98

Author: dongshuzhao

root/defaults/dns-conf/dnspod.ini

@@ -1,5 +1,5 @@
-# Instructions: https://github.com/tengattack/certbot-dns-dnspod/blob/master/certbot_dns_dnspod/__init__.py#L20
+# Instructions: https://github.com/SkyLothar/certbot-dns-dnspod#create-a-credentials-file
 # Obtain your own DNSPod API token at DNSPod console: https://console.dnspod.cn/account/token/token
-# Replace with your values
-dns_dnspod_email = [email protected]
+# Replace with your own email, id and token
+dns_dnspod_email = "[email protected]"
 dns_dnspod_api_token = "12345,1234567890abcdef1234567890abcdef"