Fix typo in comment
Fix typo in comment

Git-Host/dns,jmhodges/dns,modulexcite/dns,michaelharo/dns,ErikDubbelboer/dns,curtiszimmerman/dns,asergeyev/dns,rolandshoemaker/dns,FiloSottile/dns,ezoic/dns,flebarbe/dns,AlexCheong/dns,josephyzhou/dns,tempbottle/dns,jdef/dns,benbearchen/dns,bragr/dns,Psiphon-Inc/dns,ym/go-dns,miekg/dns,skyportsystems/dns,janstk/dns,bboreham/dns,hugozhu/dns,skynet/dns,cloudflare/dns,tsenart/dns,letsencrypt/dns