add a bit of verbosity to @drangara hypre settings

=============

The following inputs control the hypre settings and are read directly 

by AMReX when we use hypre as the bottom solver.

by AMReX when we use hypre as the bottom solver, i.e., when 

:cpp:`nodal_proj.bottom_solver = hypre` and/or when 

  :cpp:`mac_proj.bottom_solver = hypre` (see :ref:`Chap:InputsMultigrid`)

These settings must be preceded by the hypre_namespace setting corresponding 

to the solver (see :ref:`Chap:InputsMultigrid`).

NOTE: Default uses the same hypre namespace "hypre" for all solvers. However, 

the hypre namespace can be set at the solver level and the hypre settings 

can be configured for each MLMG solver.

NOTE: If either the :cpp:`nodal_proj` or :cpp:`mac_proj` bottom solvers are 

set to :cpp:`hypre`, the default behavior is to set the `hypre_namespace = "hypre"`. 

In that case, the settings below should be preceded by the (default) hypre namespace, 

:cpp:`hypre`, and apply to either or all solvers which use hypre. However, 

the hypre namespace can be set at the solver level so that the hypre settings 

can be configured for each MLMG solver. In which case, the settings below should be 

preceded by the solver specific :cpp:`hypre_namespace`. 

These settings must be preceded by the hypre_namespace setting corresponding to the solver (see :ref:`Chap:InputsMultigrid`)

+-----------------------------------+-----------------------------------------------------------------------+-------------+--------------+

|                                   |  Description                                                          |   Type      | Default      |

|                         |  Options are ij, semi_structured or structured                        |             |              | 

+-------------------------+-----------------------------------------------------------------------+-------------+--------------+

NOTE: If the :cpp:`nodal_proj` and :cpp:`mac_proj` :cpp:`hypre_namespace`'s are set, they must be distinct unless set to 

:cpp:`hypre`, in which case the default behavior is recovered in which case hypre settings apply to all solvers.  

These control the diffusion solver and must be preceded by "diffusion":

+-------------------------+-----------------------------------------------------------------------+-------------+--------------+