message: ENH: add mint/execution folder to doxygen
diff: @@ -784,6 +784,7 @@ INPUT = @PROJECT_SOURCE_DIR@/axom/mainpage.md \
  @PROJECT_SOURCE_DIR@/axom/mint/fem/shape_functions/lagrange \
  @PROJECT_SOURCE_DIR@/axom/mint/mesh \
  @PROJECT_SOURCE_DIR@/axom/mint/utils \
  + @PROJECT_SOURCE_DIR@/axom/mint/execution \
  @PROJECT_SOURCE_DIR@/axom/primal/README.md \
  @PROJECT_SOURCE_DIR@/axom/primal/geometry \
  @PROJECT_SOURCE_DIR@/axom/primal/operators \
  