Client Example: Fix closing order

[andygrunwald]

In the client example, the order on how to close elements of the session is wrong:

amqp091-go/example_client_test.go

Lines 277 to 292 in 21ccfde

	func (session *Session) Close() error {
	if !session.isReady {
	return errAlreadyClosed
	}
	err := session.channel.Close()
	if err != nil {
	return err
	}
	err = session.connection.Close()
	if err != nil {
	return err
	}
	close(session.done)
	session.isReady = false
	return nil
	}

If you first close the channel and after consider the session as done, the reconnection logic will try to re-create the channel and re-init the queue (in the example).
if you first close the done channel, you indicate that we are done with the session and the reconnection logic will end.

[michaelklishin]

This example really suffers from a newly invented concept, "session", and the confusion between AMQP 0-9-1 channels and Go channels :(

[michaelklishin]

Thank you!