fix: add some comments for later fixes

Author: yan-man

src/contracts/facilitators/gsm/converter/USTBGsmConverter.sol

@@ -90,13 +90,15 @@ contract USTBGsmConverter is Ownable, EIP712, IGsmConverter {
   }
 
   /// @inheritdoc IGsmConverter
+  // TODO: maxAmount should be the amount of GHO to be received, NOT the amount of asset to be sold
   function sellAsset(uint256 maxAmount, address receiver) external returns (uint256, uint256) {
     require(maxAmount > 0, 'INVALID_MAX_AMOUNT');
 
     return _sellAsset(msg.sender, maxAmount, receiver);
   }
 
   /// @inheritdoc IGsmConverter
+  // TODO: minAmount should be the amount of USDC to be returned to user, NOT the amount of asset to buy
   function buyAsset(uint256 minAmount, address receiver) external returns (uint256, uint256) {
     require(minAmount > 0, 'INVALID_MIN_AMOUNT');
 
@@ -167,7 +169,7 @@ contract USTBGsmConverter is Ownable, EIP712, IGsmConverter {
 
   /**
    * @notice Buys the GSM underlying asset in exchange for selling GHO, after asset redemption
-   * @param minAmount The minimum amount of the underlying asset to buy (ie BUIDL)
+   * @param minAmount The minimum amount of the underlying asset to buy (ie USTB)
    * @param receiver Recipient address of the underlying asset being purchased
    * @return The amount of underlying asset bought, after asset redemption
    * @return The amount of GHO sold by the user

src/contracts/facilitators/gsm/converter/interfaces/IGsmConverter.sol

@@ -62,6 +62,7 @@ interface IGsmConverter {
    * @dev Use `getAssetAmountForBuyAsset` function to calculate the amount based on the GHO amount to sell
    * @param originator The signer of the request
    * @param minAmount The minimum amount of the underlying asset to buy
+   TODO: fix this minAmount, it should be final min amount of USDC returned 
    * @param receiver Recipient address of the underlying asset being purchased
    * @param deadline Signature expiration deadline
    * @param signature Signature data
@@ -97,7 +98,8 @@ interface IGsmConverter {
 
   /**
    * @notice Sells the GSM underlying asset in exchange for buying GHO, after asset conversion
-   * @param maxAmount The maximum amount of the underlying asset to sell
+   * @param maxAmount The maximum amount of the underlying asset to sell 
+   TODO: fix this maxAmount, it should be final max amount of GHO amount returned 
    * @param receiver Recipient address of the GHO being purchased
    * @return The amount of underlying asset sold, after asset conversion
    * @return The amount of GHO bought by the user