[heycam/webidl] Cleanup followed by #562 (#573)

Forgot to do this in #562.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/573

-- Commit Summary --

  * cleanup followed by #562

-- File Changes --

    M index.bs (8)

-- Patch Links --

https://github.com/heycam/webidl/pull/573.patch
https://github.com/heycam/webidl/pull/573.diff

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