refactor: update command examples to use placeholder for chain name in iApp guides

Author: Le-Caignec

src/guides/build-iapp/advanced/build-your-first-sgx-iapp.md

@@ -395,7 +395,7 @@ You can check your deployed apps with their index, let's check your last
 deployed app:
 
 ```bash twoslash
-iexec app show --chain arbitrum-mainnet
+iexec app show --chain {{chainName}}
 ```
 
 ## Run the iApp
@@ -420,20 +420,20 @@ At any time you can:
 - view your balance
 
 ```bash twoslash
-iexec account show --chain arbitrum-mainnet
+iexec account show --chain {{chainName}}
 ```
 
 - deposit RLC from your wallet to your iExec Account
 
 ```bash twoslash
-iexec account deposit --chain arbitrum-mainnet <amount>
+iexec account deposit --chain {{chainName}} <amount>
 ```
 
 - withdraw RLC from your iExec account to your wallet \(only stake can be
   withdrawn\)
 
 ```bash twoslash
-iexec account withdraw --chain arbitrum-mainnet <amount>
+iexec account withdraw --chain {{chainName}} <amount>
 ```
 
 :::
@@ -478,13 +478,13 @@ is a 32Bytes hexadecimal string\).
 Download the result of your task
 
 ```bash twoslash
-iexec task show --chain arbitrum-mainnet <taskid> --download my-result
+iexec task show --chain {{chainName}} <taskid> --download my-result
 ```
 
 You can get your taskid with the command:
 
 ```bash twoslash
-iexec deal show --chain arbitrum-mainnet <dealid>
+iexec deal show --chain {{chainName}} <dealid>
 ```
 
 ::: info
@@ -526,7 +526,7 @@ The conditions to use an app are defined in the **apporder**.
 Publish a new apporder for your application.
 
 ```bash twoslash
-iexec app publish --chain arbitrum-mainnet
+iexec app publish --chain {{chainName}}
 ```
 
 ::: info
@@ -545,7 +545,7 @@ conditions defined in apporder.
 You can check the published apporders for your app
 
 ```bash twoslash
-iexec orderbook app --chain arbitrum-mainnet <your app address>
+iexec orderbook app --chain {{chainName}} <your app address>
 ```
 
 Congratulation you just created a decentralized application! Anyone can now

src/guides/build-iapp/advanced/result-callback.md

@@ -48,7 +48,7 @@ const scaled = '9';
 // ---cut---
 
 async function main() {
-  // Your business logic here
+  // Your business logic here ...
 
   const abiCoder = new AbiCoder();
   const abiPayload = abiCoder.encode(
@@ -73,13 +73,13 @@ must implement `receiveResult(bytes32,bytes)`interface from
 
 ```solidity
 contract IExecCallbackReceiver {
+    // Your business logic here ...
+
     // ERC1154 - Callback processing
     function receiveResult(bytes32 _callID, bytes memory callback) external {
         // Parse results
         (uint256 timestamp, string memory pairAndPrecision, uint256 scaledValue) =
             abi.decode(callback, (uint256, string, uint256));
-
-        ...business logic...
     }
 }
 ```