rpc: sendrawtransaction unconditionality/privacy note
rpc: sendrawtransaction unconditionality/privacy note

In sendrawtransaction RPCHelpMan, mention unconditionality and privacy
as per http://www.erisian.com.au/bitcoin-core-dev/log-2019-07-25.html#l-522

Thank you to MarcoFalke and laanwj for their review and suggestions.


Former-commit-id: 0ea2a446f5ee0732c6802ed16c08c6c8a4ef5c64
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2