fix python/examples/fit_a_line server and doc bug

python/examples/fit_a_line/README_CN.md

@@ -14,12 +14,6 @@ sh get_data.sh
 
 ### 开启服务端
 
-``` shell
-python test_server.py uci_housing_model/
-```
-
-也可以通过下面的一行代码开启默认RPC服务：
-
 ```shell
 python -m paddle_serving_server.serve --model uci_housing_model --thread 10 --port 9393
 ```

python/examples/fit_a_line/test_server.py

@@ -31,6 +31,6 @@ class UciService(WebService):
 
 uci_service = UciService(name="uci")
 uci_service.load_model_config("uci_housing_model")
-uci_service.prepare_server(workdir="workdir", port=9292)
+uci_service.prepare_server(workdir="workdir", port=9393)
 uci_service.run_rpc_service()
 uci_service.run_web_service()