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

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

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

@@ -41,7 +41,8 @@
    After the project synchronization is complete, choose **entry** > **src** > **main** > **ets** > **MainAbility** > **pages** in the **Project** window and open the **index.ets** file. You can see that the file contains a **<Text>** component. The sample code in the **index.ets** file is shown below:
 
 
-   ```
+   ```ts
+   // index.ets
    @Entry
    @Component
    struct Index {
@@ -66,7 +67,8 @@
    On the default page, add a **<Button>** component to respond to user clicks and implement redirection to another page. The sample code in the **index.ets** file is shown below:
 
 
-   ```
+   ```ts
+   // index.ets
    @Entry
    @Component
    struct Index {
@@ -119,7 +121,8 @@
    Add **<Text>** and **<Button>** components and set their styles, as you do for the first page. The sample code in the **second.ets** file is shown below:
 
 
-   ```
+   ```ts
+   // second.ets
    @Entry
    @Component
    struct Second {
@@ -161,7 +164,8 @@ You can implement page redirection through the page router, which finds the targ
    In the **index.ets** file of the first page, bind the **onClick** event to the **Next** button so that clicking the button redirects the user to the second page. The sample code in the **index.ets** file is shown below:
 
 
-   ```
+   ```ts
+   // index.ets
    import router from '@ohos.router';
    
    @Entry
@@ -205,7 +209,8 @@ You can implement page redirection through the page router, which finds the targ
    In the **second.ets** file of the second page, bind the **onClick** event to the **Back** button so that clicking the button redirects the user back to the first page. The sample code in the **second.ets** file is shown below:
 
 
-   ```
+   ```ts
+   // second.ets
    import router from '@ohos.router';
    
    @Entry