Final answer:
Cross-reference instructions in coding are used to link related codes and provide additional information.
Step-by-step explanation:
The purpose of cross-reference instructions in coding is to link related codes. Cross-references provide a way to connect different pieces of code that are related to each other. They help coders navigate through a program or document by providing additional information and guiding them to related sections.
Cross-references are commonly used in programming languages and documentation to improve code readability and maintainability.