Docs changes

Author: WardBrian

cmdstanpy/stanfit/metadata.py

@@ -47,4 +47,7 @@ def method_vars(self) -> Dict[str, stanio.Variable]:
 
     @property
     def stan_vars(self) -> Dict[str, stanio.Variable]:
+        """
+        These are the user-defined variables in the Stan program.
+        """
         return self._stan_vars

cmdstanpy/stanfit/vb.py

@@ -117,7 +117,9 @@ def stan_variable(self, var: str) -> np.ndarray:
         """
         Return a numpy.ndarray which contains the estimates for the
         for the named Stan program variable where the dimensions of the
-        numpy.ndarray match the shape of the Stan program variable.
+        numpy.ndarray match the shape of the Stan program variable, with
+        a leading axis added for the number of draws from the variational
+        approximation.
 
         This functionaltiy is also available via a shortcut using ``.`` -
         writing ``fit.a`` is a synonym for ``fit.stan_variable("a")``