[heycam/webidl] Disallow multiple keywords for SpecialOperation (#562)

Closes #470 

This was to allow `setter creator` but is not useful anymore.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/562

-- Commit Summary --

  * disallow multiple keywords for SpecialOperation

-- File Changes --

    M index.bs (8)

-- Patch Links --

https://github.com/heycam/webidl/pull/562.patch
https://github.com/heycam/webidl/pull/562.diff

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https://github.com/heycam/webidl/pull/562