[whatwg/webidl] Fix ObservableArray example (PR #1071)

It showed the wrong output for JSON.stringify().
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/webidl/pull/1071

-- Commit Summary --

  * Fix ObservableArray example

-- File Changes --

    M index.bs (6)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1071.patch
https://github.com/whatwg/webidl/pull/1071.diff

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