[heycam/webidl] Clarify the restrictions on SecureContext combinations. (#763)

Fixes #762.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/763

-- Commit Summary --

  * Clarify the restrictions on SecureContext combinations.

-- File Changes --

    M index.bs (17)

-- Patch Links --

https://github.com/heycam/webidl/pull/763.patch
https://github.com/heycam/webidl/pull/763.diff

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