refactor(mfstructure): miscellaneous

docs/mf6_dev_guide.md

@@ -35,7 +35,7 @@ The code generation utility downloads DFN files, loads them, and uses Jinja to g
 
 ## Input specification
 
-The `flopy.mf6.data.mfstructure.MFStructure` class represents an input specification. The class is a singleton, meaning only one instance of this class can be created.  The class contains a sim_struct attribute (which is a flopy.mf6.data.mfstructure.MFSimulationStructure object) which contains all of the meta-data for all package files.  Meta-data is stored in a structured format. MFSimulationStructure contains MFModelStructure and MFInputFileStructure objects, which contain the meta-data for each model type and each "simulation-level" package (tdis, ims, ...).  MFModelStructure contains model specific meta-data and a MFInputFileStructure object for each package in that model.  MFInputFileStructure contains package specific meta-data and a MFBlockStructure object for each block contained in the package file.  MFBlockStructure contains block specific meta-data and a MFDataStructure object for each data structure defined in the block, and MFDataStructure contains data structure specific meta-data and a MFDataItemStructure object for each data item contained in the data structure.  Data structures define the structure of data that is naturally grouped together, for example, the data in a numpy recarray.  Data item structures define the structure of specific pieces of data, for example, a single column of a numpy recarray.  The meta-data defined in these classes provides all the information FloPy needs to read and write MODFLOW 6 package and name files, create the Flopy interface, and check the data for various constraints.
+The `flopy.mf6.data.mfstructure.MFStructure` class represents an input specification. The class is a singleton, meaning only one instance of this class can be created.  The class exposes meta-data for all package files.  Meta-data is stored in a structured format. MFSimulationStructure contains MFModelStructure and MFInputFileStructure objects, which contain the meta-data for each model type and each "simulation-level" package (tdis, ims, ...).  MFModelStructure contains model specific meta-data and a MFInputFileStructure object for each package in that model.  MFInputFileStructure contains package specific meta-data and a MFBlockStructure object for each block contained in the package file.  MFBlockStructure contains block specific meta-data and a MFDataStructure object for each data structure defined in the block, and MFDataStructure contains data structure specific meta-data and a MFDataItemStructure object for each data item contained in the data structure.  Data structures define the structure of data that is naturally grouped together, for example, the data in a numpy recarray.  Data item structures define the structure of specific pieces of data, for example, a single column of a numpy recarray.  The meta-data defined in these classes provides all the information FloPy needs to read and write MODFLOW 6 package and name files, create the Flopy interface, and check the data for various constraints.
 
 ```mermaid
 classDiagram

flopy/mf6/data/mfdatautil.py

@@ -700,7 +700,7 @@ def _get_data_dimensions(self, model):
         from ..data import mfstructure
 
         # get structure info
-        sim_struct = mfstructure.MFStructure().sim_struct
+        sim_struct = mfstructure.MFStructure().sim_spec
         package_struct = sim_struct.get_data_structure(self.path[0:-2])
 
         # get dimension info