[streams] Add some more texts to Requirements.md about byte streams (#299)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/299

-- Commit Summary --

  * Add some more texts to Requirements.md about byte streams

-- File Changes --

    M Requirements.md (8)

-- Patch Links --

https://github.com/whatwg/streams/pull/299.patch
https://github.com/whatwg/streams/pull/299.diff

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https://github.com/whatwg/streams/pull/299