contracts: Fix OZ-N-05 Misleading or unclear comments

Also fixes OZ-N-06 which was a single typo.

packages/contracts-bedrock/contracts/L1/L2OutputOracle.sol

@@ -73,6 +73,7 @@ contract L2OutputOracle is Ownable {
      * @param _historicalTotalBlocks The number of blocks that preceding the
      *        initialization of the L2 chain.
      * @param _startingBlockTimestamp The timestamp to start L2 block at.
+     * @param sequencer The address of the sequencer.
      */
     constructor(
         uint256 _submissionInterval,

packages/contracts-bedrock/contracts/L1/OptimismPortal.sol

@@ -94,7 +94,8 @@ contract OptimismPortal is ResourceMetering {
     /**
      * @notice Accepts value so that users can send ETH directly to this contract and have the
      *         funds be deposited to their address on L2. This is intended as a convenience
-     *         function for EOAs. Contracts should call the depositTransaction() function directly.
+     *         function for EOAs. Contracts should call the depositTransaction() function directly
+     *         otherwise any deposited funds will be lost due to address aliasing.
      */
     receive() external payable {
         depositTransaction(msg.sender, msg.value, RECEIVE_DEFAULT_GAS_LIMIT, false, bytes(""));

packages/contracts-bedrock/contracts/universal/OptimismMintableTokenFactory.sol

@@ -41,6 +41,7 @@ contract OptimismMintableTokenFactory {
      * @param _remoteToken Address of the corresponding L1 token.
      * @param _name ERC20 name.
      * @param _symbol ERC20 symbol.
+     * @return Address of the new token.
      */
     function createStandardL2Token(
         address _remoteToken,

packages/contracts-bedrock/contracts/universal/StandardBridge.sol

@@ -217,7 +217,7 @@ abstract contract StandardBridge {
 
         emit ETHBridgeFinalized(_from, _to, _amount, _data);
         (bool success, ) = _to.call{ value: _amount }(new bytes(0));
-        require(success, "TransferHelper::safeTransferETH: ETH transfer failed");
+        require(success, "ETH transfer failed.");
     }
 
     /**