Update Refactor Requirements: adds code note guidances for multiple game files and moves doc from content to dev section

[suspect15]

Adds guidance for how to note sets with multiple game files as well as instances were the same address is used for different purposes on different game files.

[greptile-apps]

Confidence Score: 4/5

[Low impact] Moves and expands developer documentation about code notes.

Fix the broken sidebar link before merging.

Summary

Adds code-note guidance for multiple game files and regions.

• Code notes mark which game file or region they describe.

_{Reviews (1) · Last reviewed commit: "Update: adds guidances for multiple game..." · Reviewed by Greptile}

[greptile-apps]

Comments Outside Diff

These findings could not be posted inline.

•  Sidebar opens a missing page docs/guidelines/developers/refactor-requirements.md:1 ▶

  Moving this page leaves the sidebar pointing to /guidelines/content/refactor-requirements, which no longer exists. Readers clicking “Refactoring Requirements” reach a missing page instead of this guide.

  Suggestion: Move the sidebar entry to Developer Guidelines and update its URL.