[whatwg/storage] Clarify relation to existing storage APIs (#24)

The introduction starts with 

> Over the years the web has grown various APIs that can be used for storage, e.g., IndexedDB, localStorage, and showNotification(). The Storage Standard consolidates these APIs by defining:

Under 3. I found this note:

> This specification primarily concerns itself with site storage.

Which helps explain why there's nothing about actually storing and retrieving data. But as of now, I can't tell, for example, how I'd actually store something in combination with `navigator.storage`.  That `StoreManager` interface doesn't expose anything that could be used to actually store something; the Promises made only contain booleans.

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