Update ding_talk.md

doc/integration/ding_talk.md

@@ -60,7 +60,7 @@ Sign in to DingTalk Open Platform and create an application on it. DingTalk gene
    ```ruby
      gitlab_rails['omniauth_providers'] = [
        {
-         name: "ding_talk",
+         name: "dingtalk",
          # label: "Provider name", # optional label for login button, defaults to "Ding Talk"
          app_id: "YOUR_APP_ID",
          app_secret: "YOUR_APP_SECRET"
@@ -71,7 +71,7 @@ Sign in to DingTalk Open Platform and create an application on it. DingTalk gene
    For installations from source:
 
    ```yaml
-   - { name: 'ding_talk',
+   - { name: 'dingtalk',
        # label: 'Provider name', # optional label for login button, defaults to "Ding Talk"
        app_id: 'YOUR_APP_ID',
        app_secret: 'YOUR_APP_SECRET' }