[N-01]: Fix missing and misleading documentation (#973)

Author: pxrl

contracts/ZkSync_SpokePool.sol

@@ -46,6 +46,7 @@ contract ZkSync_SpokePool is SpokePool, CircleCCTPAdapter {
 
     /**
      * @notice Constructor.
+     * @notice Circle bridged & native USDC are optionally supported via configuration, but are mutually exclusive.
      * @param _wrappedNativeTokenAddress wrappedNativeToken address for this network to set.
      * @param _circleUSDC Circle USDC address on the SpokePool. Set to 0x0 to use the standard ERC20 bridge instead.
      * If not set to zero, then either the zkUSDCBridge or cctpTokenMessenger must be set and will be used to

contracts/chain-adapters/ZkStack_Adapter.sol

@@ -66,6 +66,7 @@ contract ZkStack_Adapter is AdapterInterface, CircleCCTPAdapter {
 
     /**
      * @notice Constructs new Adapter.
+     * @notice Circle bridged & native USDC are optionally supported via configuration, but are mutually exclusive.
      * @param _chainId The target ZkStack network's chain ID.
      * @param _bridgeHub The bridge hub contract address for the ZkStack network.
      * @param _circleUSDC Circle USDC address on L1. If not set to address(0), then either the USDCSharedBridge
@@ -200,7 +201,7 @@ contract ZkStack_Adapter is AdapterInterface, CircleCCTPAdapter {
                 );
             }
         } else {
-            // An ERC20 that is not WETH.
+            // An standard bridged ERC20, separate from WETH and Circle Bridged/Native USDC.
             address sharedBridge = BRIDGE_HUB.sharedBridge();
             IERC20(l1Token).forceApprove(sharedBridge, amount);
             txHash = BRIDGE_HUB.requestL2TransactionTwoBridges{ value: txBaseCost }(

contracts/chain-adapters/ZkStack_CustomGasToken_Adapter.sol

@@ -86,6 +86,7 @@ contract ZkStack_CustomGasToken_Adapter is AdapterInterface, CircleCCTPAdapter {
 
     /**
      * @notice Constructs new Adapter.
+     * @notice Circle bridged & native USDC are optionally supported via configuration, but are mutually exclusive.
      * @param _chainId The target ZkStack network's chain ID.
      * @param _bridgeHub The bridge hub contract address for the ZkStack network.
      * @param _circleUSDC Circle USDC address on L1. If not set to address(0), then either the USDCSharedBridge
@@ -244,7 +245,7 @@ contract ZkStack_CustomGasToken_Adapter is AdapterInterface, CircleCCTPAdapter {
                 );
             }
         } else {
-            // An ERC20 that is not WETH and not the custom gas token.
+            // An standard bridged ERC20, separate from WETH and Circle Bridged/Native USDC.
             IERC20(CUSTOM_GAS_TOKEN).forceApprove(sharedBridge, txBaseCost);
             IERC20(l1Token).forceApprove(sharedBridge, amount);
             txHash = BRIDGE_HUB.requestL2TransactionTwoBridges(