Vincent Guo 8555016eec docs: fix the payload in event-binding sample code (#30429)
after reading the context. there are  some clues to infer the payload should be the `item`, not `item.name`.
1.  EventEmitter<Item>.
2.  the desc say that:
The component defines a deleteRequest property that returns an EventEmitter. When the user clicks delete, the component invokes the delete() method, telling the EventEmitter to emit an **Item** object.

PR Close #30429
2019-05-15 14:12:02 -07:00
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