docs: update solution tree

See https://github.com/doocs/leetcode/blob/master/solution/README.md

Author: yanglbme

solution/README.md

@@ -1489,13 +1489,12 @@
 │   ├── Solution.java
 │   ├── Solution2.java
 │   └── Solution3.java
-├── 1116. Print Zero Even Odd
+├── 1116.Print Zero Even Odd
+│   ├── README.md
 │   ├── README_EN.md
+│   ├── Solution.cpp
 │   ├── Solution.java
 │   └── Solution2.java
-├── 1116.Print Zero Even Odd
-│   ├── README.md
-│   └── Solution.cpp
 ├── 1117.Building H2O
 │   ├── README.md
 │   └── Solution.cpp