Fix small typo (#4453)

Author: bene2k1

tutorials/configure-slack-alerting/index.mdx

@@ -34,7 +34,7 @@ As **we do not support Grafana managed alerts**, this documentation only shows y
 3. Enter a name for your app. For the purpose of this documentation, we are naming the app `Scaleway alerts`.
 4. Pick the workspace you want to receive alerts in from the drop-down.
 5. Click **Create App** to confirm. You app's **Basic information** page displays.
-6. Optionally, scroll down to **Display information** to customize the way your app will display in Slack. For more information, refer to the [App Detail Guidelines]((https://api.slack.com/slack-marketplace/guidelines)). For example, you can:
+6. Optionally, scroll down to **Display information** to customize the way your app will display in Slack. For more information, refer to the [App Detail Guidelines](https://api.slack.com/slack-marketplace/guidelines). For example, you can:
     - Add a short description in the **Short description** field
     - Add an icon
     - Choose a background color