improve documentation of failure info in redemption flow
@@ -58,7 +58,7 @@ outstanding TBTC from the `Deposit` (counting any existing equity).
** `bytes _signature`
* *reads*
** `address signersThresholdKeyAccount`
-** `bytes32 requestedDigest`
+** `mapping(bytes32 => bool) wasRequested`
** `uint256 withdrawalRequestTime`
* *from*
** `AWAITING_WITHDRAWAL_SIGNATURE`
@@ -124,7 +124,10 @@ outstanding TBTC from the `Deposit` (counting any existing equity).
** `bytes _requesterPKH`
* *reads*
** `address depositOwner`
+** `bytes outpoint`
* *writes*
+** `mapping(bytes32 => bool) wasRequested`
+*** record that the digest was requested
** `uint256 initialWithdrawalFee`
*** the requested withdrawal fee
** `bytes requesterPKH`
