[Serve] Update front page of serve doc (#11421)

python/ray/serve/examples/doc/quickstart_class.py

@@ -11,11 +11,12 @@ class Counter:
         self.count = 0
 
     def __call__(self, flask_request):
+        self.count += 1
         return {"current_counter": self.count}
 
 
 client.create_backend("counter", Counter)
 client.create_endpoint("counter", backend="counter", route="/counter")
 
-requests.get("http://127.0.0.1:8000/counter").json()
-# > {"current_counter": 0}
+print(requests.get("http://127.0.0.1:8000/counter").json())
+# > {"current_counter": 1}

python/ray/serve/examples/doc/quickstart_function.py

@@ -13,5 +13,5 @@ def echo(flask_request):
 client.create_backend("hello", echo)
 client.create_endpoint("hello", backend="hello", route="/hello")
 
-requests.get("http://127.0.0.1:8000/hello").text
-# > "hello serve!"
+print(requests.get("http://127.0.0.1:8000/hello").text)
+# > hello serve!