[heycam/webidl] Use [[isExtensible]] over prose. (#197)

Fixes https://www.w3.org/Bugs/Public/show_bug.cgi?id=26490.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/197

-- Commit Summary --

  * Use [[isExtensible]] over prose.

-- File Changes --

    M index.bs (29)
    M index.html (104)

-- Patch Links --

https://github.com/heycam/webidl/pull/197.patch
https://github.com/heycam/webidl/pull/197.diff

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