Re: [w3c/IndexedDB] Should it be clarified that `IDBDatabase.close()` is idempotent? (#222)

There's a case where the _close a database connection_ steps are not idempotent:

1. `close()` is called on a connection, which invokes _close a database connection_  - _forced flag_ is implicitly false. 
2. The user agent invokes _close a database connection_ with _forced flag_ true.

It's true that calling `close()` itself is idempotent, though.

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