Update 0700.二叉搜索树中的搜索.md

problems/0700.二叉搜索树中的搜索.md

@@ -230,7 +230,7 @@ class Solution {
 
 ### Python 
 
-递归法：
+（方法一） 递归
 
 ```python
 class Solution:
@@ -250,12 +250,12 @@ class Solution:
 
 ```
 
-迭代法：
+（方法二）迭代
 
 ```python
 class Solution:
     def searchBST(self, root: TreeNode, val: int) -> TreeNode:
-        while root is not None:
+        while root:
             if val < root.val: root = root.left
             elif val > root.val: root = root.right
             else: return root