[webidl] typo fix (#53)

You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/53

-- Commit Summary --

  * typo fix

-- File Changes --

    M index.xml (2)

-- Patch Links --

https://github.com/heycam/webidl/pull/53.patch
https://github.com/heycam/webidl/pull/53.diff

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https://github.com/heycam/webidl/pull/53