Update Quick_Start_EN.md

doc/Quick_Start_EN.md

@@ -8,7 +8,7 @@ This quick start example is mainly for those users who already have a model to d
 
 get into the Serving git directory, and change dir to `fit_a_line`
 ``` shell
-cd Serving/python/examples/fit_a_line
+cd Serving/examples/C++/fit_a_line
 sh get_data.sh
 ```
 
@@ -54,7 +54,7 @@ Here, `client.predict` function has two arguments. `feed` is a `python dict` wit
 
 
 ### WEB service
-Users can also put the data format processing logic on the server side, so that they can directly use curl to access the service, refer to the following case whose path is `python/examples/fit_a_line`
+Users can also put the data format processing logic on the server side, so that they can directly use curl to access the service, refer to the following case whose path is `Serving/examples/C++/fit_a_line`
 
 ```
 python3 -m paddle_serving_server.serve --model uci_housing_model --thread 10 --port 9292 --name uci