refactor 23

Author: fishercoder1534

src/main/java/com/fishercoder/solutions/_23.java

@@ -8,8 +8,19 @@
 /**
  * 23. Merge k Sorted Lists
  *
- * Merge k sorted linked lists and return it as one sorted list.
- * Analyze and describe its complexity.*/
+ * Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.
+ *
+ * Example:
+ *
+ * Input:
+ * [
+ *   1->4->5,
+ *   1->3->4,
+ *   2->6
+ * ]
+ * Output: 1->1->2->3->4->4->5->6
+ *
+ * */
 
 public class _23 {
     public static class Solution1 {