[heycam/webidl] Editorial: add back syntax highlighting for observable array example (#869)

You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/869

-- Commit Summary --

  * Editorial: add back syntax highlighting for observable array example

-- File Changes --

    M index.bs (3)

-- Patch Links --

https://github.com/heycam/webidl/pull/869.patch
https://github.com/heycam/webidl/pull/869.diff

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