[w3c/IndexedDB] Support annotated types (#217)

As Web IDL's specifications have changed, Extended Attributes which are applicable to types get to apply to types.
This pull request conform that part of the IndexedDB specifications to the Web IDL specifications.
(In detail, I swapped [EnforceRange] and optional.)
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/IndexedDB/pull/217

-- Commit Summary --

  * fix index.bs
  * fix index.html

-- File Changes --

    M index.bs (10)
    M index.html (20)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/217.patch
https://github.com/w3c/IndexedDB/pull/217.diff

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