[w3c/IndexedDB] Address missing durability attribute/docs. Fixes #316 (#317)

Closes #316 

The following tasks have been completed:

 * [x] Confirmed there are no ReSpec/BikeShed errors or warnings.

@triple-underscore - can you do an initial review?
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/IndexedDB/pull/317

-- Commit Summary --

  * Address missing durability attribute/docs. Fixes #316

-- File Changes --

    M index.bs (14)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/317.patch
https://github.com/w3c/IndexedDB/pull/317.diff

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