Fix Doxygen comments

Add additional Doxygen syntax as per Ryan's review comments.

field_manager/fm_yaml.F90

@@ -16,6 +16,7 @@
 !* You should have received a copy of the GNU Lesser General Public
 !* License along with FMS.  If not, see <http://www.gnu.org/licenses/>.
 !***********************************************************************
+
 !> @defgroup fm_yaml_mod fm_yaml_mod
 !> @ingroup fm_yaml
 !> @brief Reads entries from a field table yaml into a
@@ -37,10 +38,13 @@ module fm_yaml_mod
 implicit none
 private
 
+!> @}
+
 public :: build_fmTable
 
 !> @brief This type represents a subparameter block for a given variable parameter.
 !> This type contains the name of the associated parameter and the subparameter key/value pairs
+!> @ingroup fm_yaml_mod
 type, public :: fmAttr_t
   integer                                     :: id                    !< block id of this var
   character(len=:), allocatable               :: paramname             !< name of associated parameter
@@ -50,7 +54,8 @@ module fm_yaml_mod
 
 !> @brief This type represents the entries for a given variable, e.g. dust.
 !> This type contains the name of the variable, the block id, the key/value pairs for the
-!! variable's parameters, and any applicable subparameters
+!> variable's parameters, and any applicable subparameters
+!> @ingroup fm_yaml_mod
 type, public :: fmVar_t
   integer                                     :: id                    !< block id of this var
   character(len=:), allocatable               :: name                  !< name of the variable
@@ -61,6 +66,7 @@ module fm_yaml_mod
 
 !> @brief This type represents the entries for a given model, e.g. land, ocean, atmosphere.
 !> This type contains the name of the model, the block id, and the variables within this model
+!> @ingroup fm_yaml_mod
 type, public :: fmModel_t
   integer                       :: id                  !< block id of this model
   character(len=:), allocatable :: name                !< name of the model
@@ -69,19 +75,24 @@ module fm_yaml_mod
 
 !> @brief This type represents the entries for a specific field type, e.g. a tracer.
 !> This type contains the name of the field type, the block id, and the models within this field type
+!> @ingroup fm_yaml_mod
 type, public :: fmType_t
   integer                       :: id                  !< block id of this type
   character(len=:), allocatable :: name                !< name of the type
   type (fmModel_t), allocatable :: models(:)           !< models in this type
 end type fmType_t
 
 !> @brief This type contains the field types within a field table.
+!> @ingroup fm_yaml_mod
 type, public :: fmTable_t
   type (fmType_t), allocatable :: types(:) !< field types in this table
 end type fmTable_t
 
 contains
 
+!> @addtogroup fm_yaml_mod
+!> @{
+
 !> @brief Subroutine to populate an fmTable by reading a yaml file, given an optional filename.
 subroutine build_fmTable(fmTable, filename)
   type(fmTable_t), intent(out)           :: fmTable  !< the field table