update en/application-dev/quick-start/start-with-ets-low-code.md.

Signed-off-by: N@ge-yafang <geyafang@huawei.com>

en/application-dev/quick-start/start-with-ets-low-code.md

@@ -94,7 +94,8 @@ Add **Column**, **Text**, and **Button** components to the first page. A column
 4. Add a **Text** component.
    - In the **second.ets** file, set the message text content to **Hi there**. The sample code is as follows:
      
-      ```
+      ```ts
+      // second.ets
       @Entry
       @Component
       struct Second {
@@ -130,7 +131,8 @@ You can implement page redirection through the page router, which finds the targ
    
    - In the **index.ets** file:
      
-     ```
+     ```ts
+     // index.ets
      import router from '@ohos.router';
      
      @Entry
@@ -163,7 +165,8 @@ You can implement page redirection through the page router, which finds the targ
 
    - In the **second.ets** file:
      
-      ```
+      ```ts
+      // second.ets
       import router from '@ohos.router';
       
       @Entry