[heycam/webidl] Editorial: remove redundant requirement for existence of 'length' (#667)

The spec already requires:

> Interfaces that support indexed properties must define an integer-typed
> attribute named length.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/667

-- Commit Summary --

  * Editorial: remove redundant requirement for existence of 'length'

-- File Changes --

    M index.bs (3)

-- Patch Links --

https://github.com/heycam/webidl/pull/667.patch
https://github.com/heycam/webidl/pull/667.diff

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