[heycam/webidl] Fix the grammar for CallbackInterfaceMembers. (#753)

I accidentally missed a letter in #705.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/753

-- Commit Summary --

  * Fix the grammar for CallbackInterfaceMembers.

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/heycam/webidl/pull/753.patch
https://github.com/heycam/webidl/pull/753.diff

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