update readme

README.md

@@ -5,5 +5,7 @@ Sharding-JDBC 2.x example.
 Example for 1.x please see tags in `https://github.com/shardingjdbc/sharding-jdbc/tree/${tag}/sharding-jdbc-example`
 
 Example docs please see :  
-    EN : http://shardingjdbc.io/docs_en/01-start/code-demo/  
-    CN : http://shardingjdbc.io/docs_cn/01-start/code-demo/
+    EN : http://shardingjdbc.io/document/legacy/2.x/en/01-start/code-demo/  
+    CN : http://shardingjdbc.io/document/legacy/2.x/cn/01-start/code-demo/
+
+widows OS should use `git config --global core.longpaths true` to clone this project correctly.