Merge pull request youngyangyang04#1609 from whale2002/patch-1

Update 0046.全排列.md

Author: youngyangyang04

problems/0046.全排列.md

@@ -331,7 +331,7 @@ var permute = function(nums) {
 
 ```
 
-## TypeScript
+### TypeScript
 
 ```typescript
 function permute(nums: number[]): number[][] {