Update the doxygen comment for CameraActor 
Update the doxygen comment for CameraActor 

about DALi camera usage for 2D and 3D applications

Change-Id: I004a05a8ec895972c1b5dcfdcc26a0e29eb77209
dalihub/dali-core,dalihub/dali-core,dalihub/dali-core,dalihub/dali-core