[whatwg/streams] A few typo/spelling fixes (#910)

I noticed a few wording issues when reading the section on transform streams, and also one spelling change (in three places).
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/910

-- Commit Summary --

  * Fix a typo and a clumsily-worded sentence.
  * Prefer more widely-used spelling variant of cancellation.

-- File Changes --

    M index.bs (10)

-- Patch Links --

https://github.com/whatwg/streams/pull/910.patch
https://github.com/whatwg/streams/pull/910.diff

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