[heycam/webidl] Editorial: improve array index property name algorithm (#386)

Make it explicit that the algorithm only accepts strings as input and does not throw.

Fixes #346.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/386

-- Commit Summary --

  * Editorial: improve array index property name algorithm

-- File Changes --

    M index.bs (5)

-- Patch Links --

https://github.com/heycam/webidl/pull/386.patch
https://github.com/heycam/webidl/pull/386.diff

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