code: func WithTracing(s *session.Session) {
  	// After adding these handlers, the "Send" handler list will look
  	// something like:
  	//
  	//	opentracing.Start -> opentracing.RequestInfo -> opentracing.DynamoDBInfo -> core.ValidateReqSigHandler -> core.SendHandler
  	s.Handlers.Send.PushFrontNamed(DynamoDBInfoHandler)
  	s.Handlers.Send.PushFrontNamed(RequestInfoHandler)
  	s.Handlers.Send.PushFrontNamed(StartHandler)
  
  	s.Handlers.Complete.PushBackNamed(FinishHandler)
  }
docs: // WithTracing adds the necessary request handlers to an AWS session.Session
  // object to enable tracing with opentracing.