adds docstrings for VariableStateNameDecorator.py
adds docstrings for VariableStateNameDecorator.py

ankurankan/pgmpy,abinashpanda/pgmpy,pgmpy/pgmpy,jhonatanoliveira/pgmpy,abinashpanda/pgmpy,pgmpy/pgmpy,sandeepkrjha/pgmpy,sandeepkrjha/pgmpy,khalibartan/pgmpy,jhonatanoliveira/pgmpy,kris-singh/pgmpy,khalibartan/pgmpy,kris-singh/pgmpy,ankurankan/pgmpy