async def helpconfig(self, key):
        """Returns help about a configuration variable.

        arg:str:key:name of the configuration variable
        """
        cv = self.config.cv.from_key(key)
        short = cv.get_short_desc()
        long = cv.get_long_desc()
        if short and long:
            return short + "\n---\n\n" + long
        elif short or long:
            return short or long
        else:
            return f"No description available for '{key}'"
Returns help about a configuration variable.

        arg:str:key:name of the configuration variable
        
electrum/commands.py