Explicitly define how to handle `queryOrOptions` being omitted in `getAll`/`getAllKeys`

[jfdoming]

The IDL definition for getAll and getAllKeys lists queryOrOptions as optional; however, the algorithm 5.12 Creating a request to retrieve multiple items doesn't handle the case where queryOrOptions is not defined (and the description of the method doesn't either). There is the following note at the bottom of the algorithm:

NOTE: The range can be a key or key range (an IDBKeyRange) identifying the record items to be retrieved. If null or not given, an unbounded key range is used. If count is specified and there are more than count records in range, only the first count will be retrieved.

Based on the IDL as well as MDN and these Web Platform Tests, I think the note is meant to apply to queryOrOptions (it is not clear to me what range refers to here). Is that accurate? And if so, would it be worth updating the 5.12 algorithm to explicitly handle this case as a step?

[SteveBeckerMSFT]

Thanks for reporting this issue. #478 proposed a fix, which we are discussing in the PR.