stepmotor.h: adding doxygen tags
stepmotor.h: adding doxygen tags

Signed-off-by: John Van Drasek <514c174da16cb65a89688761b233d923b6282d4d@intel.com>

stefan-andritoiu/upm,g-vidal/upm,nitirohilla/upm,nitirohilla/upm,spitfire88/upm,Vaghesh/upm,GSmurf/upm,MakerCollider/upm,arfoll/upm,sasmita/upm,rafaneri/upm,spitfire88/upm,tylergibson/upm,ShawnHymel/upm,tripzero/upm,nitirohilla/upm,kissbac/upm,malikabhi05/upm,tylergibson/upm,Propanu/upm,sasmita/upm,tripzero/upm,intel-iot-devkit/upm,andreivasiliu2211/upm,pylbert/upm,MakerCollider/upm,g-vidal/upm,fieldhawker/upm,srware/upm,yoyojacky/upm,jontrulson/upm,malikabhi05/upm,skiselev/upm,skiselev/upm,spitfire88/upm,intel-iot-devkit/upm,GSmurf/upm,whbruce/upm,izard/upm,mircea/upm,GSmurf/upm,fieldhawker/upm,Propanu/upm,ShawnHymel/upm,andreivasiliu2211/upm,arfoll/upm,tripzero/upm,skiselev/upm,Jon-ICS/upm,Jon-ICS/upm,Jon-ICS/upm,yoyojacky/upm,afmckinney/upm,srware/upm,ShawnHymel/upm,mircea/upm,skiselev/upm,malikabhi05/upm,Propanu/upm,kissbac/upm,srware/upm,stefan-andritoiu/upm,jontrulson/upm,mircea/upm,whbruce/upm,arfoll/upm,yoyojacky/upm,g-vidal/upm,jontrulson/upm,whbruce/upm,andreivasiliu2211/upm,malikabhi05/upm,pylbert/upm,tylergibson/upm,MakerCollider/upm,tylergibson/upm,whbruce/upm,g-vidal/upm,rafaneri/upm,Vaghesh/upm,sasmita/upm,afmckinney/upm,stefan-andritoiu/upm,rafaneri/upm,sasmita/upm,andreivasiliu2211/upm,rafaneri/upm,malikabhi05/upm,intel-iot-devkit/upm,fieldhawker/upm,Jon-ICS/upm,intel-iot-devkit/upm,stefan-andritoiu/upm,ShawnHymel/upm,noahchense/upm,kissbac/upm,tripzero/upm,mircea/upm,stefan-andritoiu/upm,GSmurf/upm,yoyojacky/upm,kissbac/upm,mircea/upm,Vaghesh/upm,Propanu/upm,arfoll/upm,Propanu/upm,spitfire88/upm,Propanu/upm,andreivasiliu2211/upm,srware/upm,ShawnHymel/upm,noahchense/upm,izard/upm,afmckinney/upm,Vaghesh/upm,MakerCollider/upm,skiselev/upm,tylergibson/upm,stefan-andritoiu/upm,rafaneri/upm,pylbert/upm,afmckinney/upm,pylbert/upm,g-vidal/upm,sasmita/upm,malikabhi05/upm,pylbert/upm,intel-iot-devkit/upm,arfoll/upm,noahchense/upm,tripzero/upm,fieldhawker/upm,skiselev/upm,intel-iot-devkit/upm,afmckinney/upm,izard/upm,nitirohilla/upm,nitirohilla/upm,MakerCollider/upm,srware/upm,whbruce/upm,yoyojacky/upm,g-vidal/upm,pylbert/upm,jontrulson/upm,kissbac/upm,noahchense/upm,jontrulson/upm,spitfire88/upm,Jon-ICS/upm