docs: fix examples input

subjects/java/checkpoints/config-protector/README.md

@@ -38,17 +38,14 @@ public class ExerciseRunner {
     public static void main(String[] args) {
         ConfigProtector protector = new ConfigProtector();
 
-        // Test case 1
-        String configFile1 = "username=admin\n=localhost\n";
+        String configFile1 = "username=admin\npassword=secret\nhost=localhost\n";
         List<String> sensitiveKeys1 = Arrays.asList("password");
         System.out.println("Protected Config 1:\n" + protector.hideSensitiveData(configFile1, sensitiveKeys1));
 
-        // Test case 2
         String configFile2 = "apiKey=12345\napiSecret=abcdef\nendpoint=https://api.example.com\n";
         List<String> sensitiveKeys2 = Arrays.asList("apiKey", "apiSecret");
         System.out.println("Protected Config 2:\n" + protector.hideSensitiveData(configFile2, sensitiveKeys2));
 
-        // Test case 3
         String configFile3 = "username=user\npassword=pass\n";
         List<String> sensitiveKeys3 = Arrays.asList("username", "password");
         System.out.println("Protected Config 3:\n" + protector.hideSensitiveData(configFile3, sensitiveKeys3));