The item to update.
Optionaloptions: WeivDataOptionsOwnerAn object containing options to use when processing this operation.
Fulfilled - The object that was updated. Rejected - The error that caused the rejection.
Updates an item in a collection. !! IMPORTANT: In weiv-data you don't need to pass the al data. It's enough to just pass the updated values in your document. Anything that's not in the update object will be untouched and will stay how it was before. In wix-data if you don't pass a field in your document it will be overwritten as undefined. This doesn't apply to weiv-data. If you want this logic use replace function instead.
The ID of the collection that contains the item to update.