Update bit.md

Author: azl397985856

thinkings/bit.md

@@ -192,9 +192,9 @@ class Solution:
 
 ## 相关题目
 
-- [ ] [number-of-1-bits](https://leetcode-cn.com/problems/number-of-1-bits/)
-- [ ] [counting-bits](https://leetcode-cn.com/problems/counting-bits/)
-- [ ] [reverse-bits](https://leetcode-cn.com/problems/reverse-bits/)
+- [number-of-1-bits](https://leetcode-cn.com/problems/number-of-1-bits/)
+- [counting-bits](https://leetcode-cn.com/problems/counting-bits/)
+- [reverse-bits](https://leetcode-cn.com/problems/reverse-bits/)
 
 
 更多题解可以访问我的LeetCode题解仓库：https://github.com/azl397985856/leetcode  。 目前已经30K star啦。