Sync fastapi docs from 50fa3f7c on 2026-01-11

docs_src/path_params_numeric_validations/tutorial003_py39.py

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+from fastapi import FastAPI, Path
+
+app = FastAPI()
+
+
+@app.get("/items/{item_id}")
+async def read_items(*, item_id: int = Path(title="The ID of the item to get"), q: str):
+    results = {"item_id": item_id}
+    if q:
+        results.update({"q": q})
+    return results