Update commands.md

Author: madcowswe

docs/commands.md

@@ -124,3 +124,7 @@ odrv0.axis0.controller.vel_setpoint = 400
 odrv0.axis0.sensorless_estimator.config.pm_flux_linkage = 5.51328895422 / (<pole pairs> * <motor kv>)
 ```
 
+To start the motor:
+```
+<axis>.requested_state = AXIS_STATE_SENSORLESS_CONTROL
+```