[heycam/webidl] A few spelling fixes. (#927)

This fixes a few things that I noticed that I believe are spelling errors.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/927

-- Commit Summary --

  * A few spelling fixes.

-- File Changes --

    M index.bs (6)

-- Patch Links --

https://github.com/heycam/webidl/pull/927.patch
https://github.com/heycam/webidl/pull/927.diff

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