### What do you see as an issue?

The [/dags/{dag_id}/details](https://airflow.apache.org/docs/apache-airflow/stable/stable-rest-api-ref.html#operation/post_set_task_instances_state) endpoint of the REST API does not return all of the keys that are listed in the documentation. If I run `curl -X GET localhost:8080/api/v1/dags/{my_dag}/details`, then compare the results with the results in the documentation, you can see the following missing keys:

```python
>>> for key in docs.keys():
...     if not key in actual.keys():
...             print(key)
...
root_dag_id
last_parsed_time
last_pickled
last_expired
scheduler_lock
timetable_description
has_task_concurrency_limits
has_import_errors
next_dagrun
next_dagrun_data_interval_start
next_dagrun_data_interval_end
next_dagrun_create_after
template_search_path
```

### Solving the problem

Either remove these keys from the documentation or fix the API endpoint

### Anything else

_No response_

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

}
            },
            "schedule_interval": {
                "__type": "TimeDelta",
                "days": 1,
                "microseconds": 0,
                "seconds": 0,
            },
            "start_date": "2020-06-15T00:00:00+00:00",
            "tags": [{"name": "example"}],
            "timezone": "Timezone('UTC')",
            "max_active_runs": 16,
            "pickle_id": None,
            "end_date": None,
            "is_paused_upon_creation": None,
            "last_parsed": last_parsed,
            "render_template_as_native_obj": False,
        }
        assert response.json == expected
    def test_should_response_200_with_doc_md_none(self, current_file_token):
        response = self.client.get(
            f"/api/v1/dags/{self.dag2_id}/details", environ_overrides={"REMOTE_USER": "test"}
        )
        assert response.status_code == 200
        last_parsed = response.json["last_parsed"]
        expected = {
            "catchup": True,
            "concurrency": 16,
            "max_active_tasks": 16,
            "dag_id": "test_dag2",