Format a section node containg a summary of a Task class's key APIs.

def _format_summary_node(self, task_class):
        """Format a section node containg a summary of a Task class's key APIs.
        """
        modulename = task_class.__module__
        classname = task_class.__name__
        nodes = []

        nodes.append(
            self._format_class_nodes(task_class))

        nodes.append(
            self._format_config_nodes(modulename, classname)
        )

        methods = ('run', 'runDataRef')
        for method in methods:
            if hasattr(task_class, method):
                method_obj = getattr(task_class, method)
                nodes.append(
                    self._format_method_nodes(method_obj,
                                              modulename,
                                              classname))
        return nodes