docs: remove uncessary comments

subjects/java/checkpoints/perfect-number/ExerciseRunner.java

@@ -2,15 +2,12 @@ public class ExerciseRunner {
     public static void main(String[] args) {
         PerfectNumber perfectNumber = new PerfectNumber();
 
-        // Test case 1
         int number1 = 6;
         System.out.println("Is " + number1 + " a perfect number? " + perfectNumber.isPerfectNumber(number1));
 
-        // Test case 2
         int number2 = 28;
         System.out.println("Is " + number2 + " a perfect number? " + perfectNumber.isPerfectNumber(number2));
 
-        // Test case 3
         int number3 = 12;
         System.out.println("Is " + number3 + " a perfect number? " + perfectNumber.isPerfectNumber(number3));
     }

subjects/java/checkpoints/perfect-number/README.md

@@ -23,15 +23,12 @@ public class ExerciseRunner {
     public static void main(String[] args) {
         PerfectNumber perfectNumber = new PerfectNumber();
 
-        // Test case 1
         int number1 = 6;
         System.out.println("Is " + number1 + " a perfect number? " + perfectNumber.isPerfectNumber(number1));
 
-        // Test case 2
         int number2 = 28;
         System.out.println("Is " + number2 + " a perfect number? " + perfectNumber.isPerfectNumber(number2));
 
-        // Test case 3
         int number3 = 12;
         System.out.println("Is " + number3 + " a perfect number? " + perfectNumber.isPerfectNumber(number3));
     }