[whatwg/streams] Add WritableStream's signal definition for other specs (PR #1215)

See https://github.com/WICG/serial/pull/160.

@reillyeon, how does this look?
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1215

-- Commit Summary --

  * Add WritableStream's signal definition for other specs

-- File Changes --

    M index.bs (19)

-- Patch Links --

https://github.com/whatwg/streams/pull/1215.patch
https://github.com/whatwg/streams/pull/1215.diff

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