nitpick some headings, add a closing curly bracket in an code block

docs/build/guides/conventions/stellar-asset-contract.mdx

@@ -3,7 +3,11 @@ title: Integrate Stellar Assets Contracts
 description: Test and use Stellar assets in a Soroban smart contract
 ---
 
-When interacting with assets in a smart contract, the Stellar Asset Contract is not different from any other token that implements the Stellar [SEP-41 Token Interface]. The Rust SDK contains a pre-generated client for any contract that implements the token interface:
+When interacting with assets in a smart contract, the Stellar Asset Contract is not different from any other token that implements the Stellar [SEP-41 Token Interface].
+
+## Contract Code
+
+The Rust SDK contains a pre-generated client for any contract that implements the token interface:
 
 ```rust
 use soroban_sdk::{contract, contractimpl}
@@ -50,7 +54,7 @@ client.mint(...);
 
 :::
 
-### Testing
+## Testing
 
 Soroban Rust SDK provides an easy way to instantiate a Stellar Asset Contract tokens using `register_stellar_asset_contract`. This function can be seen as the deployment of a generic token. In the following example, we are following the best practices outlined in the [Issuing and Distribution Accounts section](../../../tokens/control-asset-access.mdx#issuing-and-distribution-accounts):
 
@@ -85,9 +89,10 @@ fn test() {
     token_sac.mint(&issuer, &distributer, &genesis_amount);
 
     assert_eq!(token.balance(&distributor), genesis_amount);
+}
 ```
 
-### Examples
+## Examples
 
 See the full examples that utilize the token contract in various ways for more details: