minor changes

src/ch02-14-security-considerations.md

@@ -370,7 +370,7 @@ Moreover, using a block explorer, we can view the deployed parameters in the tra
 
 If your smart contract requires storing private data on-chain, consider off-chain encryption before sending data to the blockchain. Alternatively, explore options like hashes, merkle trees, or commit-reveal patterns to maintain data privacy.
 
-## 5. Denial of Service.
+## 6. Denial of Service.
 
 Denial of Service (DoS), also called griefing attack, entails a situation where the atacker causes grief for other users of the protocol. A DoS attacker cripples the functionality of a Smart Contract even if they gain no economic value from doing so. A major attack vector when it comes to Denial of Service is the gas exhaustion attack. In this attack, a malicious user can call a function that needs an excessive amount of gas for execution. The consequent exhaustion of gas can cause the smart contract to stop, thus denying services to legitimate users.
 
@@ -390,6 +390,8 @@ Denial of Service (DoS), also called griefing attack, entails a situation where
                    loop {
                     // very expensive computation
                    }
+            }
+        }
     }
 ```