px4flow: update default rotation and documentation
px4flow: update default rotation and documentation

The driver performs the rotation from sensor frame to body frame.
The recommended installation default is with the Y sensor axis pointing forward.

mcgill-robotics/Firmware,krbeverx/Firmware,Aerotenna/Firmware,acfloria/Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,mcgill-robotics/Firmware,mje-nz/PX4-Firmware,mcgill-robotics/Firmware,krbeverx/Firmware,acfloria/Firmware,PX4/Firmware,PX4/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,mcgill-robotics/Firmware,acfloria/Firmware,Aerotenna/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,jlecoeur/Firmware,krbeverx/Firmware,PX4/Firmware,PX4/Firmware,mje-nz/PX4-Firmware,dagar/Firmware,krbeverx/Firmware,jlecoeur/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,dagar/Firmware,acfloria/Firmware,PX4/Firmware,acfloria/Firmware,dagar/Firmware,mcgill-robotics/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,Aerotenna/Firmware,Aerotenna/Firmware,jlecoeur/Firmware,acfloria/Firmware,PX4/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware,krbeverx/Firmware,Aerotenna/Firmware,dagar/Firmware,acfloria/Firmware,jlecoeur/Firmware,dagar/Firmware,jlecoeur/Firmware,dagar/Firmware