[heycam/webidl] detaching an ArrayBuffer should refer to ECMAScript (#200)

> To detach an ArrayBuffer is to set its buffer pointer to null.

I think this should be something like

> To detach an ArrayBuffer is to perform [DetachArrayBuffer](https://tc39.github.io/ecma262/#sec-detacharraybuffer) on the ECMAScript object that the IDL value represents

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