[whatwg/streams] Make the abstract shorter (#769)

Looking at https://spec.whatwg.org/, we're a clear outlier. It should probably just be

> The Streams Standard provides APIs for creating, composing, and consuming streams of data.

or maybe

> The Streams Standard provides APIs for creating, composing, and consuming streams of data that map efficiently to low-level I/O primitives, and allow easy composition with built-in backpressure and queuing.

Need to update it here and there.

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