CNetAddr: fix IsRFC2544 comment
CNetAddr: fix IsRFC2544 comment

Former-commit-id: f10e9c92fd78b601b8272d7658aded42b231abf0
syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin