style: format code and docs with prettier

Author: yanglbme

lcof/面试题52. 两个链表的第一个公共节点/README.md

@@ -270,12 +270,12 @@ class Solution {
     func getIntersectionNode(_ headA: ListNode?, _ headB: ListNode?) -> ListNode? {
         var a = headA
         var b = headB
-        
+
         while a !== b {
             a = a == nil ? headB : a?.next
             b = b == nil ? headA : b?.next
         }
-        
+
         return a
     }
 }