Complete the chapter on descriptor that introduces debugging CPU using QEMU and the Intel manuals

[tuhdo]

The first chapter in part 3 is intended to teach x86 memory descriptors and the guidelines to implement a simple runtime memory model. In the process, guide the readers how to use QEMU logging and various info commands, in combination with the Intel manuals to debug CPU exceptions. This is the first step to build a foundation for working on more complicated features in future chapters.

[Rafi993]

I guess the last part of chapter three after section 3.5 needs more details for beginners before reading manual. It might be intimidating for beginners to read it directly. If possible only the necessary information from the manual can be added to the text explaining in simple words. So that they could skip reading the manual till later chapters.

[tuhdo]

Thanks for the suggestion. I will improve it when I have time.