[heycam/webidl] Fix grammar reference in the definition of callback interfaces. (#765)

They no longer use InterfaceRest.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/765

-- Commit Summary --

  * Fix grammar reference in the definition of callback interfaces.

-- File Changes --

    M index.bs (5)

-- Patch Links --

https://github.com/heycam/webidl/pull/765.patch
https://github.com/heycam/webidl/pull/765.diff

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