message: Update Memory class comment
diff: @@ -115,7 +115,7 @@ MemoryClass operator*(MemoryClass mc1, MemoryClass mc2);
  A Memory object stores up to two different pointers: one host pointer (with
  MemoryType from MemoryClass::HOST) and one device pointer (currently one of
  - MemoryType: DEVICE, DEVICE_UMPIRE, DEVICE_UVM or DEVICE_DEBUG).
  + MemoryType: DEVICE, DEVICE_DEBUG, DEVICE_UMPIRE or DEVICE_MANAGED).
  A Memory object can hold (wrap) an externally allocated pointer with any
  given MemoryType.
  