Correct display of superscripts

Two superscripts were missing a backslash-escaped whitespace (see https://documatt.com/restructuredtext-reference/element/superscript.html) to be correctly displayed. Add a newline between the blocks explaining the superscripts for readability.

docs/source/ProgrammingGuide/Initialization.rst

@@ -49,7 +49,7 @@ Kokkos chooses the two spaces using the following list:
 8. `Kokkos::Threads`
 9. `Kokkos::Serial`
 
-The highest execution space in the list that is enabled is Kokkos' default execution space, and the highest enabled host execution space is Kokkos' default host execution space. For example, if  `Kokkos::Cuda`, `Kokkos::OpenMP`, and `Kokkos::Serial` are enabled, then `Kokkos::Cuda` is the default execution space and `Kokkos::OpenMP` is the default host execution space.:sup:`1`  In cases where the highest enabled backend is a host parallel execution space the `DefaultExecutionSpace` and the `DefaultHostExecutionSpace` will be the same.
+The highest execution space in the list that is enabled is Kokkos' default execution space, and the highest enabled host execution space is Kokkos' default host execution space. For example, if  `Kokkos::Cuda`, `Kokkos::OpenMP`, and `Kokkos::Serial` are enabled, then `Kokkos::Cuda` is the default execution space and `Kokkos::OpenMP` is the default host execution space\ :sup:`1`. In cases where the highest enabled backend is a host parallel execution space the `DefaultExecutionSpace` and the `DefaultHostExecutionSpace` will be the same.
 
 `Kokkos::initialize <../API/Initialize-and-Finalize.html#kokos-initialize>`_ parses the command line for flags prefixed with `--kokkos-`, and removes all recognized flags. Argument options are given with an equals (`=`) sign. If the same argument occurs more than once, the last one is used. For example, the arguments
 
@@ -76,7 +76,7 @@ Table 5.1: Command-line options for Kokkos::initialize
   * - --kokkos-device-id=INT
     - specify device id to be used by Kokkos
   * - --kokkos-map-device-id-by=(random\|mpi_rank), default: mpi_rank
-    - strategy to select device-id automatically from available devices: random or mpi_rank:sup:`2`
+    - strategy to select device-id automatically from available devices: random or mpi_rank\ :sup:`2`
   * - --kokkos-tools-libs=STR      
     - specify which of the tools to use. Must either be full path to library or name of library if the path is present in the runtime library search path (e.g. LD_LIBRARY_PATH)
   * - --kokkos-tools-help          
@@ -92,6 +92,7 @@ The values are case insensitive.
 
 
 :sup:`1` This is the preferred set of defaults when CUDA and OpenMP are enabled. If you use a thread-parallel host execution space, we prefer Kokkos' OpenMP backend, as this ensures compatibility of Kokkos' threads with the application's direct use of OpenMP threads. Kokkos cannot promise that its Threads backend will not conflict with the application's direct use of operating system threads.
+
 :sup:`2` The two device-id mapping strategies are:
 - random: select a random device from available.
 - mpi_rank: select device based on a round robin assignment of local MPI ranks. Works with OpenMPI, MVAPICH, SLURM, and derived implementations. Support for MPICH was added in Kokkos 4.0