[heycam/webidl] Update the requirement about the definition of a constructor (#697)

I didn't notice this paragraph in 8e1b52942525e9135885eba8aa68c028d2c6a5be,
where it should have been updated.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/697

-- Commit Summary --

  * Update the requirement about the definition of a constructor

-- File Changes --

    M index.bs (6)

-- Patch Links --

https://github.com/heycam/webidl/pull/697.patch
https://github.com/heycam/webidl/pull/697.diff

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