Remove vtkm::worklet from examples
It used to be convention that when you created a worklet you would put it in the vtkm::worklet
namespace and place it in a header file for everyone to use. It is now more conventional to define them in .cxx files (or in a local header not intended for other use). Thus, the examples of worklets in the User's guide should avoid defining worklet implementations in the vtkm::worklet
space.