[heycam/webidl] Fix sentence that required optionality values to be boolean (#394)

Fixes https://www.w3.org/Bugs/Public/show_bug.cgi?id=25628.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/394

-- Commit Summary --

  * Fix sentence that required optionality values to be boolean

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/heycam/webidl/pull/394.patch
https://github.com/heycam/webidl/pull/394.diff

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https://github.com/heycam/webidl/pull/394