fix typo (#692)
fix typo (#692)


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