[whatwg/streams] Fix couple typos (#1052)

This fixes a bad reference to `ReadableStreamDefaultReader` and replaces a repeated `preventCancel` parameter with the missing `preventAbort`.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1052

-- Commit Summary --

  * Fix a couple typos

-- File Changes --

    M index.bs (6)

-- Patch Links --

https://github.com/whatwg/streams/pull/1052.patch
https://github.com/whatwg/streams/pull/1052.diff

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https://github.com/whatwg/streams/pull/1052