Update go.mdx (#12506)

go连接器，rest连接示例代码错误纠正，     var taosUri = "root:taosdata/http(localhost:6041)/"   ==>  var taosUri = "root:taosdata@http(localhost:6041)/"

docs-cn/14-reference/03-connector/go.mdx

@@ -168,7 +168,7 @@ import (
 )
 
 func main() {
-    var taosUri = "root:taosdata/http(localhost:6041)/"
+    var taosUri = "root:taosdata@http(localhost:6041)/"
     taos, err := sql.Open("taosRestful", taosUri)
     if err != nil {
         fmt.Println("failed to connect TDengine, err:", err)