[streams] typo (#257)

You can merge this Pull Request by running:

  git pull https://github.com/hax/streams patch-1

Or you can view, comment on it, or merge it online at:

  https://github.com/whatwg/streams/pull/257

-- Commit Summary --

  * typo

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/257.patch
https://github.com/whatwg/streams/pull/257.diff

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https://github.com/whatwg/streams/pull/257