message: Update code comments for Memory space to refer only to CUDA
diff: namespace adios2
  {
  -/** Memory space for the buffers received with Put */
  +/** Memory space for the user provided buffers */
  enum class MemorySpace
  {
  Detect, ///< Detect the memory space automatically
  Host, ///< Host memory space (default)
  - CUDA ///< GPU memory spaces
  + CUDA ///< CUDA memory spaces
  };
  /** Variable shape type identifier, assigned automatically from the signature of
  