message: Update axis.hpp
  Added direction  in the comments for the error codes to go look at the relevant hpp. When skimming the help documentation one assumes you arrive at an unhelpful error, such as ERROR_MOTOR_FAILED, when there is more information to be had.
diff: @@ -49,9 +49,9 @@ public:
  ERROR_CURRENT_MEASUREMENT_TIMEOUT = 0x08,
  ERROR_BRAKE_RESISTOR_DISARMED = 0x10, //<! the brake resistor was unexpectedly disarmed
  ERROR_MOTOR_DISARMED = 0x20, //<! the motor was unexpectedly disarmed
  - ERROR_MOTOR_FAILED = 0x40,
  + ERROR_MOTOR_FAILED = 0x40, // Go to motor.hpp for information, check odrvX.axisX.motor.error for error value
  ERROR_SENSORLESS_ESTIMATOR_FAILED = 0x80,
  - ERROR_ENCODER_FAILED = 0x100,
  + ERROR_ENCODER_FAILED = 0x100, // Go to encoder.hpp for information, check odrvX.axisX.encoder.error for error value
  ERROR_CONTROLLER_FAILED = 0x200,
  ERROR_POS_CTRL_DURING_SENSORLESS = 0x400,
  };
  