message: DOC: document MPI shared memory fix
  Document MPI shared memory fix for Quest's signed distance
  query in the release notes.
diff: @@ -60,6 +60,9 @@ The Axom project release numbers follow [Semantic Versioning](http://semver.org/
  ex. `level_error` is now `message_error`.
  ### Fixed
  +- Fixed issue in Quest's Signed Distance query that would prevent consecutive
  + calls to Quest when MPI-3 shared memory is enabled due to not properly
  + nullifying internal pointers when finalize is called.
  - Fixed issue where the BVH would dispatch to the CPU sort() routine when the
  specified execution policy was CUDA_EXEC async. Now, when the execution policy
  is CUDA_EXEC the code would correctly dispatch to the GPU sort, using CUB
  