fix: update question link in readme document

close doocs#722

Author: yanglbme

README.md

@@ -122,8 +122,8 @@
 -   [从中序与后序遍历序列构造二叉树](/solution/0100-0199/0106.Construct%20Binary%20Tree%20from%20Inorder%20and%20Postorder%20Traversal/README.md)
 -   [二叉搜索树的后序遍历序列](/lcof/面试题33.%20二叉搜索树的后序遍历序列/README.md)
 -   [二叉搜索树迭代器](/solution/0100-0199/0173.Binary%20Search%20Tree%20Iterator/README.md)
--   [二叉树的最近公共祖先](/solution/0200-0299/0235.Lowest%20Common%20Ancestor%20of%20a%20Binary%20Search%20Tree/README.md)
--   [二叉搜索树的最近公共祖先](/solution/0200-0299/0236.Lowest%20Common%20Ancestor%20of%20a%20Binary%20Tree/README.md)
+-   [二叉搜索树的最近公共祖先](/solution/0200-0299/0235.Lowest%20Common%20Ancestor%20of%20a%20Binary%20Search%20Tree/README.md)
+-   [二叉树的最近公共祖先](/solution/0200-0299/0236.Lowest%20Common%20Ancestor%20of%20a%20Binary%20Tree/README.md)
 -   [将二叉搜索树转换为单链表](/lcci/17.12.BiNode/README.md)
 -   [将二叉搜索树转化为排序的双向链表](/solution/0400-0499/0426.Convert%20Binary%20Search%20Tree%20to%20Sorted%20Doubly%20Linked%20List/README.md)
 -   [二叉树的边界](/solution/0500-0599/0545.Boundary%20of%20Binary%20Tree/README.md)