Fix typos in SkeletonNamingConvention, correct reference

Fix typos in OSI_SkeletonNamingConvention.jpg and change the incorrect
reference in osi_object.proto from BaseMoving::position to
BaseMoving::orientation.

Signed-off-by: Jakob Peintner <jakob.peintner@thi.de>

Author: Peintnerer

doc/images/OSI_SkeletonNamingConvenion.jpg

@@ -566,7 +566,7 @@ message MovingObject
         // Orientation of the skeleton point
         //
         // Reference System is the middle of the bounding box (\c MovingObject::base 
-        // \c BaseMoving::position).
+        // \c BaseMoving::orientation).
         //
         required Orientation3d orientation = 3;