Update example code in "Sending events to JavaScript"

[phamhieu]

We should call "sendDeviceEventWithName" instead of "sendAppEventWithName" in

- (void)calendarEventReminderReceived:(NSNotification *)notification
{
  NSString *eventName = notification.userInfo[@"name"];
  [self.bridge.eventDispatcher sendAppEventWithName:@"EventReminder"
                                               body:@{@"name": eventName}];
}

[vjeux]

@sahrens can you look at this?

[brentvatne]

@sahrens @vjeux - this is not necessary if we merge #918

[sahrens]

Yeah, closing in favor of #918.