Material Theming: Android Basics with Compose - Add a top bar : Scaffold syntax would deserve more details

[Elaws]

URL of codelab

Codelab lesson

In which task and step of the codelab can this issue be found?

Task 7 : "Add a top bar".

Describe the problem

"Scaffold" are introduced but since their syntax is more elaborated than e.g. a simple Column, it would deserve to be explained with more details : trailing lambda syntax is already explained in a previous unit, but it would be a great opportunity to explain them again in this new context.