[whatwg/streams] Add some missing exclamation marks (#927)

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

Also remove a stray space.

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

  https://github.com/whatwg/streams/pull/927

-- Commit Summary --

  * Add some missing exclamation marks

-- File Changes --

    M index.bs (10)
    M reference-implementation/web-platform-tests (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/927.patch
https://github.com/whatwg/streams/pull/927.diff

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