code: def returns(self):
          
          kind = "({}) ".format(self.kind) if self.kind is not None else ""      
          mods = ", ".join(self.modifiers) + " "
          dtype = self.dtype if self.dtype is not None else ""
          return "{}{}{}".format(dtype, kind, mods)
docs: Gets a string showing the return type and modifiers for the
          function in a nice display format.