docs: fix typo in model refactoring example

[riobits]

Fixes a typo in the model refactoring example. The inline validation block incorrectly used age: as the schema key instead of body:.

Summary by CodeRabbit

• Documentation
  • Updated the OpenAPI tutorial example so the request body schema now uses body instead of age in the reference model example.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: cf8c27dd-1fc4-4441-9028-ac1ccb01c9ee

📥 Commits

Reviewing files that changed from the base of the PR and between b8eced1 and 1aa3f8d.

📒 Files selected for processing (1)

• docs/tutorial/features/openapi/index.md

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Walkthrough

Updated the OpenAPI tutorial’s Reference Model example so the schema property shown in the .model({ ... }) block is now body instead of age.

Changes

OpenAPI tutorial example update

Layer / File(s)	Summary
Reference model field name docs/tutorial/features/openapi/index.md	The Reference Model example renames the object property from age to body in the schema declaration.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

Tiny docs tweak, so sly and neat ♡
age waved bye-bye, body took the seat ~
Just one little name, no grand parade (¬‿¬)
Yet the tutorial got its makeover made ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the documentation typo fix in the OpenAPI model example.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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