[whatwg/streams] Editorial: Update use of WebIDL "invoke a callback function" (PR #1320)

The only use which is not promise-returning is the "start" algorithm, which should rethrow the exception (so it can in turn be rethrown from the ReadableStream constructor.

Part of whatwg/webidl#1425.

- [x] At least two implementers are interested (and none opposed): n/a (no normative change)
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(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

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

  https://github.com/whatwg/streams/pull/1320

-- Commit Summary --

  * Editorial: Update use of WebIDL "invoke a callback function"

-- File Changes --

    M index.bs (4)

-- Patch Links --

https://github.com/whatwg/streams/pull/1320.patch
https://github.com/whatwg/streams/pull/1320.diff

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