[TD-6337]<docs>: fix taosdemo.go compile and build guidelines [ci skip]

documentation20/cn/08.connector/docs.md

@@ -971,8 +971,12 @@ Go连接器支持的系统有：
 ```
 在taosdemo.go所在目录下进行编译和执行：
 ```sh
-  go mod init *demo*  
+go mod init taosdemo
-  go build   ./demo -h fqdn -p serverPort  
+go get github.com/taosdata/driver-go/taosSql
+# use win branch in Windows platform.
+#go get github.com/taosdata/driver-go/taosSql@win
+go build
+./taosdemo -h fqdn -p serverPort
 ```
 
 ### Go连接器的使用