Merge pull request #24 from mickeyouyou/patch-2

Update LeetCode No.231：pow of 2

notes/LeetCode第231号问题：2的幂.md

@@ -15,7 +15,7 @@
 ```
 输入: 1
 输出: true
-解释: 20 = 1
+解释: 2^0 = 1
 ```
 
 **示例 2:**
@@ -23,7 +23,7 @@
 ```
 输入: 16
 输出: true
-解释: 24 = 16
+解释: 2^4 = 16
 ```
 
 **示例 3:**
@@ -80,4 +80,4 @@ public:
 
 
 
-![](https://bucket-1257126549.cos.ap-guangzhou.myqcloud.com/blog/fz0rq.png)
\ No newline at end of file
+![](https://bucket-1257126549.cos.ap-guangzhou.myqcloud.com/blog/fz0rq.png)