All documentation and examples can be found in the public organization: https://github.com/CrossTheRoadElec
There many examples in all three FRC languages available at:
https://github.com/CrossTheRoadElec/Phoenix-Examples-Languages
https://github.com/CrossTheRoadElec/Phoenix-Examples-LabVIEW
https://api.ctr-electronics.com/phoenix/release/java/
https://api.ctr-electronics.com/phoenix/release/cpp/
Core documentation for the base FRC control system. https://docs.wpilib.org
https://docs.wpilib.org/en/latest/docs/software/can-devices/power-distribution-panel.html
https://docs.wpilib.org/en/latest/docs/software/can-devices/using-can-devices.html
https://docs.wpilib.org/en/latest/docs/software/can-devices/pneumatics-control-module.html
https://docs.wpilib.org/en/latest/docs/hardware/hardware-basics/wiring-pneumatics.html