code: func TransactionSetName(id int64, name string) (int, error) {
  	cname := C.CString(name)
  	defer C.free(unsafe.Pointer(cname))
  
  	return errNo(C.newrelic_transaction_set_name(C.long(id), cname))
  }
docs: /*
   * Set the name of a transaction.
   *
   * @param transaction_id  id of transaction
   * @param name  transaction name
   * @return  0 on success, else negative warning code or error code
   */