? operator should be in the first, not last, sub-section of 18.4. Result

Since the ? operator is in the last sub-section of 18.4. Result, all the other sub-sections and the main section are filled with code of the type:

let number = match number_str.parse::<i32>() {
    Ok(number)  => number,
    Err(e) => return Err(e),
};

This is really confusing. Especially for someone who is reading the sections in order because in 18.3. Option & unwrap, the ? operator is in the first sub-section. You are telling the reader what the good way of doing something is but then giving him 4 sections of code written in what you just described as the worse way of doing it...

Start by locating the chapter 18.4 Result content and compare its subsection order with 18.3 Option & unwrap. Review the examples as they appear in sequence, then confirm that the ? operator is introduced in the intended position and that the surrounding examples remain consistent.