message: Update src/axom/core/docs/sphinx/core_acceleration.rst
  Reword based on review comments
diff: @@ -8,13 +8,12 @@ Core acceleration
  ******************************************************
  Axom's `core` component provides several utilities for user applications that
  -support execution on hardware accelerators. Axom lets users control execution
  -space using RAJA and memory space using Umpire. As noted in the
  -`RAJA documentation <https://raja.readthedocs.io/en/main/index.html>`_,
  +support execution on hardware accelerators. Axom lets users control the execution
  +space (i.e. *where* code runs) using RAJA and movement between memory spaces using Umpire.
  +As noted in the `RAJA documentation <https://raja.readthedocs.io/en/main/index.html>`_,
  developers of high-performance computing applications have many options for
  running code: on the CPU, using OpenMP, or on GPU hardware accelerators, and
  -the options are constantly evolving. RAJA controls *where* code runs; Umpire
  -moves data between memory spaces.
  +the options are constantly evolving.
  .. note::
  * Axom's memory management and execution space APIs have default
  