Update docs for response-model

[junhl]

As of Python 3.9, you no longer have to use List from typing for type hinting.

The code example is updated but there is a sentence that was not updated accordingly in docs.

[junhl]

Moved For example, ... to new line like L33 for consistency.

[github-actions]

📝 Docs preview for commit 5935199 at: https://af6de111.sqlmodel.pages.dev

Modified Pages

• https://af6de111.sqlmodel.pages.dev/tutorial/fastapi/response-model/ - (before)

[svlandeg]

Hi @junhl, thanks for contributing to sqlmodel! You're right, and there's already an open PR to address this: #1147

As the existing PR also includes additional cases that can be updated, we can continue the discussion there and I'll close this one. But thanks again! 🙏