Update examples of pipeline low precison

examples/Pipeline/LowPrecision/ResNet50_Slim/README.md

-# Imagenet Pipeline WebService
+# Low precsion examples of python pipeline 
 
-This document will takes Imagenet service as an example to introduce how to use Pipeline WebService.
+Here we take the ResNet50 quantization model as an example to introduce the low-precision deployment case of Python Pipline.
 
 ## 1.Get model
 ```

examples/Pipeline/LowPrecision/ResNet50_Slim/README_CN.md

-# Low precsion of ResNet50 Pipeline WebService
+# Python Pipeline 低精度部署案例
 
-这里以 ResNet50 的低精度模型为例介绍 Pipeline WebService 的部署和使用。
+这里以 ResNet50 量化模型 为例，介绍 Python Pipline 低精度部署案例。
 
 ## 1.获取模型
 ```