Clarify weird behavior of the LIS3MDL
Clarify weird behavior of the LIS3MDL

See issue #12514

PX4/Firmware,krbeverx/Firmware,PX4/Firmware,PX4/Firmware,acfloria/Firmware,dagar/Firmware,PX4/Firmware,krbeverx/Firmware,PX4/Firmware,dagar/Firmware,PX4/Firmware,dagar/Firmware,dagar/Firmware,krbeverx/Firmware,PX4/Firmware,acfloria/Firmware,krbeverx/Firmware,acfloria/Firmware,acfloria/Firmware,krbeverx/Firmware,krbeverx/Firmware,dagar/Firmware,krbeverx/Firmware,dagar/Firmware,acfloria/Firmware,dagar/Firmware,acfloria/Firmware,acfloria/Firmware