fix: [N-06] TODO Comments (#325)

* fix: [N02] Add docstring

Signed-off-by: Matt Rice <matthewcrice32@gmail.com>

* fix: [N-06] TODO Comments

Signed-off-by: Matt Rice <matthewcrice32@gmail.com>

---------

Signed-off-by: Matt Rice <matthewcrice32@gmail.com>

Author: mrice32

contracts/ZkSync_SpokePool.sol

@@ -12,9 +12,6 @@ interface ZkBridgeLike {
     ) external;
 }
 
-// TODO: Find the mainnet source code, can't seem to find it in here:
-// https://github.com/matter-labs/era-contracts/blob/6391c0d7bf6184d7f6718060e3991ba6f0efe4a7/zksync/contracts
-// https://github.com/matter-labs/v2-testnet-contracts/blob/main/l2/system-contracts/L2EthToken.sol#L74
 interface IL2ETH {
     function withdraw(address _l1Receiver) external payable;
 }

contracts/chain-adapters/ZkSync_Adapter.sol

@@ -154,8 +154,7 @@ contract ZkSync_Adapter is AdapterInterface {
     // Bridges to send ERC20 and ETH to L2. Fetchable via `zks_getBridgeContracts` method on JSON RPC.
     ZkBridgeLike public constant zkErc20Bridge = ZkBridgeLike(0x57891966931Eb4Bb6FB81430E6cE0A03AAbDe063);
 
-    // Set l1Weth at construction time to make testing easier. TODO: Think of some way to be able to hardcode this
-    // while keeping unit tests easy to write with custom WETH that we can mint/transfer.
+    // Set l1Weth at construction time to make testing easier.
     WETH9Interface public immutable l1Weth;
 
     event ZkSyncMessageRelayed(bytes32 canonicalTxHash);