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[mktemp] remove old comment

Heather/coreutils,keunwoo/coreutils,Arcterus/coreutils,keunwoo/coreutils,ebfe/coreutils,kevgeniy/coreutils,kevgeniy/coreutils,uutils/coreutils,wimh/coreutils,dbrgn/coreutils,jbcrail/coreutils,dbrgn/coreutils,ebfe/coreutils,kwantam/coreutils,jbcrail/coreutils,Heather/coreutils,uutils/coreutils,wimh/coreutils,dbrgn/coreutils,kwantam/coreutils,Arcterus/coreutils,tempbottle/coreutils,tempbottle/coreutils,uutils/coreutils