[heycam/webidl] Correct the spelling of "additionally" (#590)

"Additionally" was spelt "additionaly" in a number of places. Fix it.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/590

-- Commit Summary --

  * Correct the spelling of "additionally"

-- File Changes --

    M index.bs (8)

-- Patch Links --

https://github.com/heycam/webidl/pull/590.patch
https://github.com/heycam/webidl/pull/590.diff

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