📝 Use return type annotation instead of response_model when possible

[YuriiMotov]

Specifying the return type annotation should be a default way to specify response model.
This PR updates code examples to specify response model as return type annotation where it's possible.

I checked that surrounding text doesn't refer to response_model and highlights didn't get broken

[github-actions]

📝 Docs preview

Last commit 838a5f8 at: https://1b2bf129.fastapitiangolo.pages.dev

Modified Pages

• https://1b2bf129.fastapitiangolo.pages.dev/tutorial/path-operation-configuration/ - (before)

[codspeed-hq]

Merging this PR will not alter performance

✅ 20 untouched benchmarks

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_{Comparing use-return-type-annotation-instead-of-response_model-when-possible (838a5f8) with master (2eb978b)¹}

Footnotes

1. No successful run was found on master (e0abd21) during the generation of this report, so 2eb978b was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩