message: Fix typo
  change from "thow" to "throw".
diff: @@ -356,7 +356,7 @@ namespace eosio { namespace chain {
  /**
  * This method performs some consistency checks on a transaction.
  - * @thow transaction_exception if the transaction is invalid
  + * @throw transaction_exception if the transaction is invalid
  */
  template<typename T>
  void validate_transaction(const T& trx) const {
  