[whatwg/streams] fix internal slot descriptions (#553)

Some descriptions were outdated, one was never accurate in the first place.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/553

-- Commit Summary --

  * fix internal slot descriptions
  * fix [[autoAllocateChunkSize]] description
  * fix [[underlyingSink]] description

-- File Changes --

    M index.bs (12)

-- Patch Links --

https://github.com/whatwg/streams/pull/553.patch
https://github.com/whatwg/streams/pull/553.diff

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https://github.com/whatwg/streams/pull/553