Update reverse-linked-list.md

Author: lightningtgc

coder/linked-lists/reverse-linked-list.md

@@ -1,5 +1,5 @@
-## Reverse a singly linked list
+### Reverse a singly linked list
 
-#### Q: Given the pointer/reference to the head of a singly linked list, 
+Q: Given the pointer/reference to the head of a singly linked list, 
 
-#### reverse it and return the pointer/reference to the head of reversed linked list.
+reverse it and return the pointer/reference to the head of reversed linked list.