[whatwg/streams] Add some missing exclamation marks (#935)

Some invocations of abstract operations were missing the ! prefix to
assert that they never return an abrupt completion. Add the missing !
prefixes.

No semantic changes.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/935

-- Commit Summary --

  * Add some missing exclamation marks

-- File Changes --

    M index.bs (10)

-- Patch Links --

https://github.com/whatwg/streams/pull/935.patch
https://github.com/whatwg/streams/pull/935.diff

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