refactor 206

Author: fishercoder1534

src/main/java/com/fishercoder/solutions/_206.java

@@ -5,7 +5,15 @@
 /**
  * 206. Reverse Linked List
  *
- * Reverse a singly linked list.*/
+ * Reverse a singly linked list.
+ *
+ * Example:
+ * Input: 1->2->3->4->5->NULL
+ * Output: 5->4->3->2->1->NULL
+ *
+ * Follow up:
+ * A linked list can be reversed either iteratively or recursively. Could you implement both?
+ * */
 public class _206 {
 
     public static class Solution1 {