[heycam/webidl] Specify value in setter steps (#917)

I think this was missing from #882. cc @annevk @domenic.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/917

-- Commit Summary --

  * Specify value in setter steps

-- File Changes --

    M index.bs (5)

-- Patch Links --

https://github.com/heycam/webidl/pull/917.patch
https://github.com/heycam/webidl/pull/917.diff

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