[heycam/webidl] Clean up some parts of object creation (#663)

Addresses part of #655.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/663

-- Commit Summary --

  * Some stylistic editing
  * Define internal slots of objects directly

-- File Changes --

    M index.bs (67)

-- Patch Links --

https://github.com/heycam/webidl/pull/663.patch
https://github.com/heycam/webidl/pull/663.diff

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