[models] Include the axis default value in L3 missing default error message

Author: chrissimpkins

src/slice/models.py

@@ -328,8 +328,8 @@ def subspace_data_validates_includes_default_value(self, range_list, axistag):
         default = self.get_default_axis_value(axistag)
         if default < range_list[0] or default > range_list[1]:
             raise ValueError(
-                f"{axistag} range {range_list[0]}:{range_list[1]} does not "
-                f"include the default axis value.  This is currently a "
+                f"The {axistag} range {range_list[0]}:{range_list[1]} does not "
+                f"include the default axis value ({default}).  This is currently a "
                 f"requirement."
             )