[heycam/webidl] Specify that dictionaries can't be the type of attr/constant (#940)

The same sentence is already in [Dictionary section](https://heycam.github.io/webidl/#idl-dictionaries), and this change copy-pastes it to the [Types - Dictionary types](https://heycam.github.io/webidl/#idl-dictionary) for consistency with other Types sections.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/940

-- Commit Summary --

  * Specify that dictionaries can't be the type of attr/constant

-- File Changes --

    M index.bs (12)

-- Patch Links --

https://github.com/heycam/webidl/pull/940.patch
https://github.com/heycam/webidl/pull/940.diff

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