[w3c/IndexedDB] Editorial: Add note about close() being idempotent. (#281)

Resolves #222

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

  https://github.com/w3c/IndexedDB/pull/281

-- Commit Summary --

  * Editorial: Add note about close() being idempotent.

-- File Changes --

    M index.bs (5)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/281.patch
https://github.com/w3c/IndexedDB/pull/281.diff

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