Sets the docstring of this interface using the docstrings of its embedded
        module procedures that it is an interface for.

def find_docstring(self):
        """Sets the docstring of this interface using the docstrings of its embedded
        module procedures that it is an interface for.
        """
        #The docstrings for the interface are compiled from the separate docstrings
        #of the module procedures it is an interface for. We choose the first of these
        #procedures by convention and copy its docstrings over.
        #Just use the very first embedded method that isn't None and has a docstring.
        if self.first and len(self.docstring) == 0:
            self.docstring = self.first.docstring