[heycam/webidl] Improve the definition of the void type. (#757)

In particular, this acknowledges that `Promise<void>` exists.

This also ensures that the handling of `void` return types is defined fully.

Fixes #737.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/757

-- Commit Summary --

  * Improve the definition of the void type.

-- File Changes --

    M index.bs (28)

-- Patch Links --

https://github.com/heycam/webidl/pull/757.patch
https://github.com/heycam/webidl/pull/757.diff

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https://github.com/heycam/webidl/pull/757