[heycam/webidl] Link to ES for "array index" (#427)

Kept an explicit algorithm for determining if a property name is an array index as someone (forgot who) found it to be helpful.

Fixes #409.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/427

-- Commit Summary --

  * Link to ES for "array index"

-- File Changes --

    M index.bs (36)

-- Patch Links --

https://github.com/heycam/webidl/pull/427.patch
https://github.com/heycam/webidl/pull/427.diff

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