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docs(destructuring): 补全报错信息

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这样直接看代码的话，更能直观了解到要先声明 y 才能使用它，而不是在声明 y 前就使用它。
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@ -169,10 +169,10 @@ if ([1][0] === undefined) {
let [x = 1, y = x] = []; // x=1; y=1
let [x = 1, y = x] = [2]; // x=2; y=2
let [x = 1, y = x] = [1, 2]; // x=1; y=2
let [x = y, y = 1] = []; // ReferenceError
let [x = y, y = 1] = []; // ReferenceError: y is not defined
```
上面最后一个表达式之所以会报错，是因为`x`用到默认值`y`时，`y`还没有声明。
上面最后一个表达式之所以会报错，是因为`x`用`y`做默认值时，`y`还没有声明。
## 对象的解构赋值