docs: update docs and remove unused errors

src/pool-cl/VeCakeMembershipHook.sol

@@ -93,7 +93,7 @@ contract VeCakeMembershipHook is CLBaseHook {
             return (this.afterSwap.selector, 0);
         }
 
-        /// @dev this is POC code, do not use for production!! 
+        /// @dev this is POC code, do not use for production, this is only for POC.
         /// Assumption: currency1 is subsidised currency and if veCake user swap token0 for token1, give 5% more token1.
         if (param.zeroForOne && veCake.balanceOf(tx.origin) >= 1 ether) {
 

src/pool-cl/VeCakeSwapDiscountHook.sol

@@ -12,13 +12,13 @@ interface IVeCake {
     function balanceOf(address account) external view returns (uint256 balance);
 }
 
-/// @notice VeCakeSwapDiscountHook allows veCake to get 50% off swap fee
+/// @notice VeCakeSwapDiscountHook provides 50% swap fee discount for veCake holder
+/// Idea: 1. PancakeSwap has veCake (vote-escrowed Cake), user obtain veCake by locking cake
+///       2. If the swapper holds veCake, provide 50% swap fee discount
 contract VeCakeSwapDiscountHook is CLBaseHook {
     using PoolIdLibrary for PoolKey;
     using LPFeeLibrary for uint24;
 
-    error PoolNotOpenForPublicTradeYet();
-
     IVeCake public veCake;
     mapping(PoolId => uint24) public poolIdToLpFee;
 

src/pool-cl/VeCakeWhitelistHook.sol

@@ -14,6 +14,8 @@ interface IVeCake {
 }
 
 /// @notice VeCakeWhitelistHook allows only veCake holder to trade with the pool within the first hour
+/// Idea: 1. A PCS partner protocol launch a new protocol by adding liquidity XX-ETH 
+///       2. Only veCake holder can buy the token in the first hour and public access will be granted after.  
 contract VeCakeWhitelistHook is CLBaseHook {
     using PoolIdLibrary for PoolKey;