

**Description**

Update https://github.com/apache/airflow/blob/master/airflow/example_dags/tutorial_taskflow_api_etl.py tp use `@dag` decorator instead of leveraging context manager to make it more TaskFlow-y.


airflow/example_dags/tutorial_taskflow_api_etl.py
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"""
### TaskFlow API Tutorial Documentation
This is a simple ETL data pipeline example which demonstrates the use of the TaskFlow API
using three simple tasks for Extract, Transform, and Load.
Documentation that goes along with the Airflow TaskFlow API tutorial located
[here](https://airflow.apache.org/docs/stable/tutorial_taskflow_api.html)
"""
import json
from airflow import DAG
from airflow.utils.dates import days_ago