Re: [whatwg/streams] Add explainer for transferable streams (#956)

This sounds great! 😄 

After a `ReadableStream` or `WritableStream` is transferred, the original thread must no longer be able to use it. I guess that means it should be considered "locked" from the perspective of that thread? That is: `locked` equals `true`, and `getReader()` and `getWriter()` throw an "already locked" error?

> It's possible to emulate this behaviour by using postMessage() directly. Existing techniques for moving work off the main thread often resemble a subset of this functionality. However, it is clumsy and hard to work with.

Can confirm, very clumsy. That didn't stop me from trying though: [remote-web-streams](https://github.com/MattiasBuelens/remote-web-streams). 😛 

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