[whatwg/streams] Add a couple of missing exclamation marks standard text (#699)

WritableStreamDefaultControllerAdvanceQueueIfNeeded was missing the "!" which
indicates that we expect the call to the abstract operation to always succeed in
two places.

Add them.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/699

-- Commit Summary --

  * Add a couple of missing exclamation marks standard text

-- File Changes --

    M index.bs (4)

-- Patch Links --

https://github.com/whatwg/streams/pull/699.patch
https://github.com/whatwg/streams/pull/699.diff

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