fix doc link

doc/DESIGN_DOC.md

@@ -60,7 +60,7 @@ Docker is an open source application container engine that allows developers to
 Paddle Serving provides 4 development language client SDKs, including Python, C++, Java, and Golang. Golang SDK is under construction, We hope that interested open source developers can help submit PR.
 
 + Python, Refer to the client example under python/examples or 4.2 web service example.
-+ C++, Refer to《[从零开始写一个预测服务](deprecated/CREATING.md)》
++ C++, Refer to《[从零开始写一个预测服务](CREATING.md)》
 + Java, Refer to《[Paddle Serving Client Java SDK](JAVA_SDK.md)》
 + Golang, Refer to《[How to use Go Client of Paddle Serving](deprecated/IMDB_GO_CLIENT.md)》
 

doc/DESIGN_DOC_CN.md

@@ -61,7 +61,7 @@ Docker 是一个开源的应用容器引擎，让开发者可以打包他们的
 
 Paddle Serving提供了4种开发语言SDK，包括Python、C++、Java、Golang。Golang SDK在建设中，有兴趣的开源开发者可以提交PR。
 + Python，参考python/examples下client示例 或 4.2 web服务示例
-+ C++，参考《[从零开始写一个预测服务](deprecated/CREATING.md)》
++ C++，参考《[从零开始写一个预测服务](CREATING.md)》
 + Java，参考《[Paddle Serving Client Java SDK](JAVA_SDK_CN.md)》
 + Golang，参考《[如何在Paddle Serving使用Go Client](deprecated/IMDB_GO_CLIENT_CN.md)》