add serving demo

demo/serving/Semantic_Model_simnet_bow/README.md

 ## 数据格式  
 input: {"text1": [text_a1, text_a2, ...], "text2": [text_b1, text_b2, ...]}  
-output: {"result":[result_1, result_2, ...]}  
+output: {"results":[result_1, result_2, ...]}  
 
 ## Serving快速启动命令  
 ```shell

demo/serving/Semantic_Segmentation_deeplabv3p_xception65_humanseg/README.md

@@ -8,7 +8,7 @@ $ hub serving start -m deeplabv3p_xception65_humanseg
 ```  
 
 ## python脚本  
-```
+```shell
 $ python deeplabv3p_xception65_humanseg_serving_demo.py
 ```