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docs(ArrayBuffer): add conversion demos

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docs/arraybuffer.md
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@ -273,6 +273,10 @@ const typedArray = new Uint8Array([1, 2, 3, 4]);
TypedArray数组也可以转换回普通数组。
```javascript
const normalArray = [...typedArray];
// or
const normalArray = Array.from(typedArray);
// or
const normalArray = Array.prototype.slice.call(typedArray);
```