add a comment for 232

Author: fishercoder1534

src/main/java/com/fishercoder/solutions/_232.java

@@ -5,6 +5,9 @@
 public class _232 {
 
     public static class Solution1 {
+        /**
+         * This is amortized O(1) time for each operation, explanation: https://leetcode.com/problems/implement-queue-using-stacks/solution/
+         */
         class MyQueue {
 
             Stack<Integer> input = new Stack();