[w3c/IndexedDB] Specify the error code for failures when reading a value from disk (PR #430)

This PR:
- Updates the description of `UnknownError` to convey that it should be used for transient reasons, per the [Web IDL Standard](https://webidl.spec.whatwg.org/#unknownerror).
- Adds `NotReadableError` from the [Web IDL Standard](https://webidl.spec.whatwg.org/#notreadableerror) to the list of possible exceptions.
- Specifies `NotReadableError` to be returned when reading the value from the underlying storage fails in the `object-store-retrieval-operation` algorithms.

Closes #423

The following tasks have been completed:

 * [ ] Confirmed there are no ReSpec/BikeShed errors or warnings.
 * [ ] Modified Web platform tests (link to pull request)

Implementation commitment:

 * [ ] WebKit (https://bugs.webkit.org/show_bug.cgi?id=)
 * [ ] Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
 * [ ] Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=)


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/IndexedDB/pull/430

-- Commit Summary --

  * Specify NotReadableError for read failures arising from the underlying storage

-- File Changes --

    M index.bs (17)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/430.patch
https://github.com/w3c/IndexedDB/pull/430.diff

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