added a refrence of section 4.3 to 3.4 instead of moving a large section of 4.3

[DieuMerci225]

Description

I went with the reference approach since it keeps the chapter structure intact and avoids moving a large section. I added a cross-reference in 3.4, right where try/catch is first introduced, pointing readers to the exception handling section (4.3) for a fuller explanation.

fixes #258

tested with local build

Reviewed by @habibasorour

[pearcej]

I don't agree. The flow of the text needs to be logical, and it needs to build. One should NOT have to jump forward and eseentially read a whole chapter on file handling.

[DieuMerci225]

@pearcej That makes sense working on another solution to solve the issue

[pearcej]

@DieuMerci225 I expect the original contribution was from an AI tool. Think about what is learning appropriate at this point.

[DieuMerci225]

@pearcej The issue suggested that since 3.4 introduces try/catch, the exception handling section could either become a subsection of 3.4 or be linked from it. After re-reading both sections, I think the best move is to keep 3.4's explanation minimal rather than expanding it. It already explains try/catch well enough for what this chapter needs, which is just handling the one exception in the file-opening example. Making it a subsection or forcing a jump to a later chapter would pull in more than the reader needs at this point. The deeper explanation belongs in 4.3 on exception handling, and 3.4 already notes that more detail comes later in the book, which is exactly what happens in 4.3.