refactor: sample app get balance docs

Author: nattb8

sample/Assets/Scripts/ZkEvmGetBalance.cs

@@ -30,22 +30,33 @@ void Start()
         }
     }
 
+    /// <summary>
+    /// Gets the balance of the account for the specified address.
+    /// The balance is obtained in hexadecimal format and then converted to decimal for display.
+    /// </summary>
     public async void GetBalance()
     {
-        ShowOutput($"Called GetBalance()...");
+        ShowOutput("Getting account balance...");
 
         try
         {
-            string balance = await Passport.ZkEvmGetBalance(AddressInput.text);
-            var balanceBI = BigInteger.Parse(balance.Replace("0x", "0"), NumberStyles.HexNumber);
-            ShowOutput($"Hex: {balance}\nDec: {balanceBI}");
+            // Retrieve the balance in hexadecimal format
+            string balanceHex = await Passport.ZkEvmGetBalance(AddressInput.text);
+
+            // Convert the hexadecimal balance to a BigInteger for decimal representation
+            var balanceDec = BigInteger.Parse(balanceHex.Replace("0x", ""), NumberStyles.HexNumber);
+
+            // Display both hexadecimal and decimal representations of the balance
+            ShowOutput($"Balance:\nHex: {balanceHex}\nDec: {balanceDec}");
         }
         catch (Exception ex)
         {
             ShowOutput($"Failed to get balance: {ex.Message}");
         }
     }
 
+
+
     /// <summary>
     /// Navigates back to the authenticated scene.
     /// </summary>