Update README.md

README.md

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 ## Workerman 3.0 
 
-文档: [http://doc3.workerman.net](http://doc3.workerman.net)
+中文文档: [http://doc3.workerman.net](http://doc3.workerman.net)
 
 Documentation:[https://github.com/walkor/workerman-manual](https://github.com/walkor/workerman-manual/blob/master/english/src/SUMMARY.md)