No, no documentation, but to be honest, I don't think there are many. Stock Android 11 on the Pro1x actually is pretty nice and runs very smoothly. If you add Finqwerty (particularly the corrected one Rob S made available), it's really nice keyboard experience.
LOS doesn't fix many things... if you are having problems with LTE and cell signal in stock, you will probably still have them in LOS. You get some additional features, you get a great reduction in bloat if you don't use a lot of google apps, the keyboard mapping works fine without Finqwerty, and you get up-to-date Android secur