Merge pull request #1313 from ethereum-optimism/alcueca-patch-2

Add detail on how to finalize a withdrawal

Author: krofax

pages/stack/transactions/withdrawal-flow.mdx

@@ -79,6 +79,8 @@ The next step is to wait the fault challenge period, to ensure that the L2 outpu
 
 Finally, once the fault challenge period passes, the withdrawal can be finalized and executed on L1.
 
+To do so, a user, either an externally owned account (EOA) directly or a contract acting on behalf of an EOA, calls the [`finalizeWithdrawalTransaction`](https://github.com/ethereum-optimism/optimism/blob/62c7f3b05a70027b30054d4c8974f44000606fb7/packages/contracts-bedrock/contracts/L1/OptimismPortal.sol#L320-L420) function of the [`OptimismPortal`](https://github.com/ethereum-optimism/optimism/blob/62c7f3b05a70027b30054d4c8974f44000606fb7/packages/contracts-bedrock/contracts/L1/OptimismPortal.sol) contract.
+
 ## Expected internal reverts in withdrawal transactions
 
 During the withdrawal process, users may observe internal reverts when viewing the transaction on **Etherscan**. This is a common point of confusion but is expected behavior.