Fix typo in comment (#1939)
Fix typo in comment (#1939)

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ii/coredns,coredns/coredns,jremond/coredns,chrisohaver/coredns,johnbelamaric/coredns,miekg/coredns,yongtang/coredns,jremond/coredns,miekg/coredns,ii/coredns,johnbelamaric/coredns