Re: [streams] Merge ReadableByteStream into ReadableStream (#430)

I added some examples to the appendix. Please review them for correctness. Especially [the socket one](https://streams.spec.whatwg.org/branch-snapshots/rsrbsmergesquash/#example-rbs-push), as I am not sure that `socket.setTCPWindowSize(0)` is the correct way to signal backpressure, or if `socket.setTCPWindowSize` is a realistic API. (I tried to look through tcp(7) man pages but there was no straightforward thing saying "here is how you set the TCP window size", so maybe we should use a more complicated example API.) Is this at all how things might be implemented under the hood in Blink, @yutakahirano?

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