Create go.mdx (#12479)

go 原生连接里  示例写错纠正      var taosUri = "root:taosdata/tcp(localhost:6030)/"   ==>      var taosUri = "root:taosdata@tcp(localhost:6030)/"

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

@@ -136,7 +136,7 @@ import (
 )
 
 func main() {
-    var taosUri = "root:taosdata/tcp(localhost:6030)/"
+    var taosUri = "root:taosdata@tcp(localhost:6030)/"
     taos, err := sql.Open("taosSql", taosUri)
     if err != nil {
         fmt.Println("failed to connect TDengine, err:", err)