docs: Google DNS should use dns.google instead of dns.google.com #664
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Background
Since Google recommend to use dns.google as a DoH server and we are trying add DoH support, and use both of them as a UDP or TCP DNS server is equal, so we can change the default config and docs early
https://developers.google.com/speed/public-dns/docs/doh/migration?hl=zh-cn#base64url
#649 (comment)
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