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

docs_src/path_params/tutorial001_py310.py

@@ -0,0 +1,8 @@
+from fastapi import FastAPI
+
+app = FastAPI()
+
+
+@app.get("/items/{item_id}")
+async def read_item(item_id):
+    return {"item_id": item_id}