I am still using my raspberry pi 3 and bought the raphael kit some time ago but the documentation recently switched to rpi4 and 5. Where do I get the rpi3 documentation?
You can just follow the tutorial for adapting PI4.
Because PI3 and PI4 use the same RPi.GPIO library, they are both compatible to work.
PI5 uses the GPIO Zero library, that’s why the tutorials are differentiated.