message: Fix warning in transaction c api docs
diff: @@ -76,8 +76,6 @@ extern "C" {
  * @brief Cancels a deferred transaction.
  *
  * @param sender_id - The id of the sender
  - * @param length - Data length
  - * @param hash - `checksum256*` hash to compare to
  *
  * @pre The deferred transaction ID exists.
  * @pre The deferred transaction ID has not yet been published.
  