[w3c/IndexedDB] Use (DOMString or sequence<DOMString>) for keyPath (#236)

Fixes #235 

[Per the spec](https://www.w3.org/TR/IndexedDB-2/#dom-idbobjectstore-keypath):

>The key path is converted as a DOMString (if a string) or a sequence<DOMString> (if a list of strings), per [WEBIDL].

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

  https://github.com/w3c/IndexedDB/pull/236

-- Commit Summary --

  * use (DOMString or sequence<DOMString>) for keyPath

-- File Changes --

    M index.bs (4)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/236.patch
https://github.com/w3c/IndexedDB/pull/236.diff

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