### 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)

"default_view": None,
                "last_parsed_time": None,
                "scheduler_lock": None,
                "timetable_description": None,
                "has_import_errors": None,
                "pickle_id": None,
            },
        ],
        "total_entries": 2,
    } == schema.dump(instance)
@pytest.mark.db_test
def test_serialize_test_dag_detail_schema(url_safe_serializer):
    dag = DAG(
        dag_id="test_dag",
        start_date=datetime(2020, 6, 19),
        doc_md="docs",
        orientation="LR",
        default_view="duration",
        params={"foo": 1},
        tags=["example1", "example2"],
    )
    schema = DAGDetailSchema()
    expected = {
        "catchup": True,
        "concurrency": 16,
        "max_active_tasks": 16,
        "dag_id": "test_dag",
        "dag_run_timeout": None,
        "default_view": "duration",
        "description": None,