Suggestion: Call Stack & Message Queue and Event Loop Should be next to each order

[deyvisonIO]

The problem is that by separating the two topic, one at number 1 and the others at number 9, it creates unnecessary confusion to anyone trying to learn it. By making then next to each other (callback as number 1 and event loop/message queue as number 2 for example) it creates a more intuitive learning experience.