message: rawtransaction: fix argument in combinerawtransaction help message
diff: @@ -619,7 +619,7 @@ static UniValue combinerawtransaction(const JSONRPCRequest& request)
  {
  {"txs", RPCArg::Type::ARR, RPCArg::Optional::NO, "The hex strings of partially signed transactions",
  {
  - {"hexstring", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, "A transaction hash"},
  + {"hexstring", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, "A hex-encoded raw transaction"},
  },
  },
  },
  