[w3c/IndexedDB] Editorial: Improve example's text around uniqueness. (#318)

Closes #181 

Non-normative changes. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/IndexedDB/pull/318

-- Commit Summary --

  * Editorial: Improve example's text around uniqueness.

-- File Changes --

    M index.bs (26)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/318.patch
https://github.com/w3c/IndexedDB/pull/318.diff

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