DOC: Add short description for examples

Examples/Audio/Audio.cpp

Examples/BoneDrilling/BoneDrilling.cpp

Examples/CameraController/CameraController.cpp

Examples/DeformableBody/DeformableBody.cpp

Examples/ExtractSurface/ExtractSurface.cpp

Examples/GeometryTransforms/GeometryTransforms.cpp

Examples/Graph/Graph.cpp

...LaparoscopicToolController/LaparoscopicToolController.cpp

Examples/MeshIO/MeshIO.cpp

Examples/MshVegaIO/MshVegaIO.cpp

Examples/ObjectController/ObjectController.cpp

Examples/PBDCloth/pbdClothExample.cpp

Examples/PBDCollision/PBDCollisionExample.cpp

Examples/PBDFluids/PBDFluidsExample.cpp

Examples/PBDVolume/PBDVolumeExample.cpp

Examples/Picking/Picking.cpp

Examples/PlotVectors/PlotVectors.cpp

Examples/Rendering/Rendering.cpp

Examples/SceneManagement/SceneManagement.cpp

Examples/Screenshot/Screenshot.cpp