style: 代码highlight

problems/1020.飞地的数量.md

@@ -395,7 +395,7 @@ class Solution {
 
 深度优先遍历
 
-```Python3
+```Python
 class Solution:
     def __init__(self):
         self.position = [[-1, 0], [0, 1], [1, 0], [0, -1]]	# 四个方向
@@ -442,7 +442,7 @@ class Solution:
 
 广度优先遍历
 
-```Python3
+```Python
 class Solution:
     def __init__(self):
         self.position = [[-1, 0], [0, 1], [1, 0], [0, -1]]	# 四个方向