Update state/failure for collateralization check
@@ -231,7 +231,7 @@ fraud-related state transitions in a single document.
** `block.timestamp`
** `uint256 fundedAt`
*** to check if the deposit is expiring
-** `uint256 isUndercollateralized()`
+** `bool getCollateralizationPercentage() < TBTCConstants.getUndercollateralizedPercent()`
*** Check the oracle to see if collateral is sufficient
* *from*
** `COURTESY_CALL`
