[streams] Add spec texts for ReadableByteStreamController.close() and operations reachable from it (#416)

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

  https://github.com/whatwg/streams/pull/416

-- Commit Summary --

  * Add a spec text for ReadableByteStreamController's close() method
  * Added spec texts for all operations readable from ReadableByteStreamController.close()

-- File Changes --

    M index.bs (134)
    M reference-implementation/lib/readable-byte-stream.js (16)

-- Patch Links --

https://github.com/whatwg/streams/pull/416.patch
https://github.com/whatwg/streams/pull/416.diff

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https://github.com/whatwg/streams/pull/416