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This is based on user feedback and changes the DocumentSnapshot API to return null for non-existing documents (instead of throwing an Exception). Since Queries never return null documents, this PR also introduces QueryDocumentSnapshot, which overrides the DocumentSnapshot methods to be non-nullable (mostly relevant for TypeScript).
This is a port of firebase/firebase-js-sdk#364
There are also some random documentation changes here and there that I noticed while looking at the generated documentation.