You have 3 options:
- Web Archive waybackmachine
pros: You get the linking between functions
cons: Not all pages work
https://archive.org/web/
- Source code: (.h files)
Pros: everything is there
Cons: no linking between stuff
- Python developer tools
Pros: Readily available directly in Krita and filterable for convenience
Cons: You need Krita open to run it