grove: added comments to Grove LED C++ example
grove: added comments to Grove LED C++ example

Signed-off-by: Sarah Knepper <aa6f32c7068de0436ab460eb7d52c137f945f426@intel.com>

noahchense/upm,tripzero/upm,ShawnHymel/upm,whbruce/upm,g-vidal/upm,fieldhawker/upm,jontrulson/upm,intel-iot-devkit/upm,Vaghesh/upm,fieldhawker/upm,g-vidal/upm,spitfire88/upm,Jon-ICS/upm,Jon-ICS/upm,Propanu/upm,kissbac/upm,skiselev/upm,Propanu/upm,tylergibson/upm,andreivasiliu2211/upm,skiselev/upm,noahchense/upm,tylergibson/upm,yoyojacky/upm,0xD34D/upm,srware/upm,g-vidal/upm,pylbert/upm,fieldhawker/upm,noahchense/upm,pylbert/upm,pylbert/upm,GSmurf/upm,sasmita/upm,Vaghesh/upm,malikabhi05/upm,malikabhi05/upm,MakerCollider/upm,afmckinney/upm,tripzero/upm,afmckinney/upm,yoyojacky/upm,rafaneri/upm,skiselev/upm,srware/upm,MakerCollider/upm,Vaghesh/upm,Propanu/upm,arfoll/upm,whbruce/upm,spitfire88/upm,malikabhi05/upm,GSmurf/upm,intel-iot-devkit/upm,yoyojacky/upm,kissbac/upm,whbruce/upm,srware/upm,GSmurf/upm,whbruce/upm,nitirohilla/upm,andreivasiliu2211/upm,izard/upm,stefan-andritoiu/upm,fieldhawker/upm,tylergibson/upm,rafaneri/upm,g-vidal/upm,MakerCollider/upm,stefan-andritoiu/upm,jontrulson/upm,afmckinney/upm,arfoll/upm,GSmurf/upm,kissbac/upm,arfoll/upm,intel-iot-devkit/upm,stefan-andritoiu/upm,mircea/upm,nitirohilla/upm,andreivasiliu2211/upm,mircea/upm,izard/upm,malikabhi05/upm,sasmita/upm,kissbac/upm,Propanu/upm,g-vidal/upm,malikabhi05/upm,arfoll/upm,andreivasiliu2211/upm,skiselev/upm,intel-iot-devkit/upm,skiselev/upm,Jon-ICS/upm,noahchense/upm,rafaneri/upm,MakerCollider/upm,nitirohilla/upm,spitfire88/upm,0xD34D/upm,tylergibson/upm,ShawnHymel/upm,pylbert/upm,MakerCollider/upm,nitirohilla/upm,stefan-andritoiu/upm,mircea/upm,spitfire88/upm,afmckinney/upm,afmckinney/upm,stefan-andritoiu/upm,sasmita/upm,jontrulson/upm,mircea/upm,g-vidal/upm,Jon-ICS/upm,srware/upm,tripzero/upm,andreivasiliu2211/upm,skiselev/upm,izard/upm,Jon-ICS/upm,rafaneri/upm,jontrulson/upm,tylergibson/upm,spitfire88/upm,0xD34D/upm,kissbac/upm,Vaghesh/upm,0xD34D/upm,sasmita/upm,malikabhi05/upm,Propanu/upm,yoyojacky/upm,stefan-andritoiu/upm,rafaneri/upm,mircea/upm,nitirohilla/upm,arfoll/upm,srware/upm,whbruce/upm,ShawnHymel/upm,ShawnHymel/upm,intel-iot-devkit/upm,intel-iot-devkit/upm,pylbert/upm,tripzero/upm,pylbert/upm,Propanu/upm,yoyojacky/upm,jontrulson/upm,sasmita/upm,tripzero/upm,ShawnHymel/upm