fix readme codestyle

duyiqi17 · duyiqi17 · commit 43ed4cc828a5 · 2021-03-19T18:12:30.000+08:00
diff --git a/models/recall/mind/README.md b/models/recall/mind/README.md
@@ -1,7 +1,7 @@
 # MIND(Multi-Interest Network with Dynamic Routing)
 
 以下是本例的简要目录结构及说明： 
-```shell
+```
 ├── data #样例数据
 │   ├── demo                    #demo训练数据
 │   │   └── demo.txt     
