[Docs] clarify helper.Data for update

[mdavis-xyz]

If I want to return properties after creation (helper.Data.update({})), what do I have to do when updating?

If an update does not change the returned properties, can I just not touch helper.Data? Or do I need to fetch the data from somewhere else and pass it in again?

If an update does change the returned properties, but not all of them, do I only need to pass the new ones to helper.Data.update({})?

[mdavis-xyz]

After playing around, it seems like helper.Data.update({}) needs to be updated for every call to update the resource, even if the resource is unchanged.