[streams] Typo in TeeReadableStream (#398)

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

  https://github.com/whatwg/streams/pull/398

-- Commit Summary --

  * fix typo

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/398.patch
https://github.com/whatwg/streams/pull/398.diff

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https://github.com/whatwg/streams/pull/398