📝 Update source examples and docs from Python 3.9 to 3.10 (#14900)

docs_src/settings/tutorial001_py310.py

@@ -0,0 +1,21 @@
+from fastapi import FastAPI
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    app_name: str = "Awesome API"
+    admin_email: str
+    items_per_user: int = 50
+
+
+settings = Settings()
+app = FastAPI()
+
+
+@app.get("/info")
+async def info():
+    return {
+        "app_name": settings.app_name,
+        "admin_email": settings.admin_email,
+        "items_per_user": settings.items_per_user,
+    }