Minor docs additions

[retronica]

System refered to below: 1.5GHz PowerBook G4 [PowerBook6,8]

Configuration > Apple Hardware > Audio:
Might be worth adding a quick line or two about saving the configured alsamixer settings. At least on my system PCM got muted at each reboot - I was able to rectify this with sudo alsactl store.

Configuration > Graphics > Geforce FX Series:
GeForce FX series cards are currently listed as being unknown whether they work. My system has an FX 5200 Go which appears to be working acceptably using nouveau. I did see some weird translucent blue rectangle areas in the inbuilt browser as well as midori. Don't recall seeing any issues in Arcticfox. inxi -Gxxx and glxgears -info report OpenGL is v1.5