message: DOC: rename CUDA exec template param for clarity
diff: @@ -85,22 +85,22 @@ required by all of the constituent functions of the
  :ref:`sections/execution_model`. Axom defines a set of high-level execution
  spaces, summarized in the table below.
  -+----------------------------------+--------------------------------+---------------------------------+
  ++------------------------------------+--------------------------------+---------------------------------+
  | Execution Policy | Requirements | Description |
  | | | |
  -+==================================+================================+=================================+
  ++====================================+================================+=================================+
  | **SEQ_EXEC** | None. | Sequential execution on |
  | | | the CPU. |
  -+----------------------------------+--------------------------------+---------------------------------+
  ++------------------------------------+--------------------------------+---------------------------------+
  | **OMP_EXEC** | `RAJA`_ + OpenMP | Parallel execution on |
  | | | the CPU using OpenMP. |
  -+----------------------------------+--------------------------------+---------------------------------+
  -| **CUDA_EXEC< NBLOCKS >** | `RAJA`_ + CUDA + | Parallel execution on |
  ++------------------------------------+--------------------------------+---------------------------------+
  +| **CUDA_EXEC< BLOCKSIZE >** | `RAJA`_ + CUDA + | Parallel execution on |
  | | `Umpire`_ (memory management) | CUDA-enabled GPUs. |
  -+----------------------------------+--------------------------------+---------------------------------+
  -| **CUDA_EXEC< NBLOCKS, ASYNC >** | `RAJA`_ + CUDA + | Asynchronous parallel |
  ++------------------------------------+--------------------------------+---------------------------------+
  +| **CUDA_EXEC< BLOCKSIZE, ASYNC >** | `RAJA`_ + CUDA + | Asynchronous parallel |
  | | `Umpire`_ (memory management) | execution on CUDA-enabled GPUs. |
  -+----------------------------------+--------------------------------+---------------------------------+
  ++------------------------------------+--------------------------------+---------------------------------+
  Internally, the implementation uses the ``axom::execution_space`` traits object
  to map each execution space to corresponding `RAJA`_ execution policies and
  