added multiple lines shell example

[HarshitNagpal29]

fix: https://github.com/apache/dolphinscheduler/issues/8955

Brief Summary of The Change

Pull Request checklist

I confirm that the following checklist has been completed.

• [ ] Add/Change test cases for the changes.
• [ ] Add/Change the related documentation, should also change docs/source/config.rst when you change file default_config.yaml.
• [ ] (Optional) Add your change to UPDATING.md when it is an incompatible change.

[HarshitNagpal29]

@ zhongjiajie please review it once. I have made changes in shell task also added parameter for our example and string formatting as well.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.93%. Comparing base (e04b836) to head (a6b5e29). Report is 7 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #133 +/- ## ======================================= Coverage 90.93% 90.93% ======================================= Files 64 64 Lines 2361 2361 ======================================= Hits 2147 2147 Misses 214 214 ``` | [Flag](https://app.codecov.io/gh/apache/dolphinscheduler-sdk-python/pull/133/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/apache/dolphinscheduler-sdk-python/pull/133/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `90.93% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache#carryforward-flags-in-the-pull-request-comment) to find out more.

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