Fix translation (#175)

```
That’s not to say that block-scoped variable can never be declared with a function-scoped variable. The block-scoped variable just needs to be declared within a distinctly different block.
```

doc/handbook/Variable Declarations.md

@@ -291,8 +291,8 @@ function g() {
 }
 ```
 
-并不是说块级作用域变量不能在函数作用域内声明。
-而是块级作用域变量需要在不用的块里声明。
+并不是说块级作用域变量不能用函数作用域变量来声明。
+而是块级作用域变量需要在明显不同的块里声明。
 
 ```ts
 function f(condition, x) {