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

docs_src/response_status_code/tutorial001_py310.py

@@ -0,0 +1,8 @@
+from fastapi import FastAPI
+
+app = FastAPI()
+
+
+@app.post("/items/", status_code=201)
+async def create_item(name: str):
+    return {"name": name}

docs_src/response_status_code/tutorial002_py310.py

@@ -0,0 +1,8 @@
+from fastapi import FastAPI, status
+
+app = FastAPI()
+
+
+@app.post("/items/", status_code=status.HTTP_201_CREATED)
+async def create_item(name: str):
+    return {"name": name}