code: def _render_our_module_key_flags(self, module, output_lines, prefix=''):
      
      key_flags = self.get_key_flags_for_module(module)
      if key_flags:
        self._render_module_flags(module, key_flags, output_lines, prefix)
docs: Returns a help string for the key flags of a given module.
  
      Args:
        module: module|str, the module to render key flags for.
        output_lines: [str], a list of strings.  The generated help message
            lines will be appended to this list.
        prefix: str, a string that is prepended to each generated help line.