Nit about deleteDatabase error example

[brettz9]

For the recent addition for deleteDatabase stating:

Delete db. If this fails for any reason, return an appropriate error (e.g. "QuotaExceededError" or "UnknownError" DOMException).

...I am guessing that the use of "QuotaExceededError" was a carry-over from the open example as it wouldn't seem to me to be a valid error one would encounter on attempting to delete a database.

[inexorabletash]

Yes, it's copy/paste.

It's plausible if the implementation's backing store adds tombstones rather than immediately deleting information (as leveldb does). It'd be a poor implementation that didn't allow for deletes in this case, however (Chrome special cases delete-only transactions, etc to be "free")

[inexorabletash]

I'm going to leave this as is, as I want to imply that "UnknownError" should be the last choice. This text is pretty squishy anyway ("appropriate error ... e.g. ..." in normative text?)