[Feature][python] Add missing example for tasks

[zhongjiajie]

Search before asking

• I had searched in the issues and found no similar feature requirement.

Description

When I initiation python api in #8005, I found out there are some tasks without examples. It is users friendly if all our tasks have documents, and make easier for green hand.

Use case

No response

Related issues

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[github-actions]

Hi:

• Thank you for your feedback, we have received your issue, Please wait patiently for a reply.
• In order for us to understand your request as soon as possible, please provide detailed information、version or pictures.
• If you haven't received a reply for a long time, you can subscribe to the developer's email，Mail subscription steps reference https://dolphinscheduler.apache.org/en-us/community/development/subscribe.html ,Then write the issue URL in the email content and send question to dev@dolphinscheduler.apache.org.