List 6.3 event name should be “lastPrice” not “last-price”

[yanyu0517]

As the code show，the name of event should be same as @output property which is ”lastPrice“，but in following bold string ：

“On the application level, the event handler for the last-price event is invoked to display the price quote that arrives with the event object”

The event which is named "lastPrice" is called "last-price" wrongly