[whatwg/streams] Editorial: fix some double-word typos (#887)

Noticed by the new-ish linter in the WHATWG deploy script.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/887

-- Commit Summary --

  * Editorial: fix some double-word typos

-- File Changes --

    M index.bs (6)

-- Patch Links --

https://github.com/whatwg/streams/pull/887.patch
https://github.com/whatwg/streams/pull/887.diff

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