[AB3: Tracing Code]: Clarify what Event Driven Mechanisms is

[tayruxin]

Current:

Problem: Students might not understand what it means by “various event-driven mechanisms” and may be confused on the choice of placing the breakpoint where the UI transfer controls to the logic component.

Proposed: Add a paragraph after the highlighted part:

This is because, unlike linear command-line programs, GUI applications respond to user actions (like clicks and keystrokes) and other events, triggering various event listeners and handlers. This non-linear flow of control can make it difficult to trace and debug the sequence of operations, as the program reacts dynamically to different events, creating an obscure execution path.

[damithc]

@tayruxin I've added this extra info as a tooltip, in https://se-education.org/guides/tutorials/ab3TracingCode.html so that only those who are unfamiliar with the term can read the additional info. Does that a good-enough solution?

[tayruxin]

I think that will be a good solution as it does not make the whole tutorial lengthy and students who are unsure can refer to the additional information.