integration-docs: Update Librato for new doc format.

Part of #29592.

zerver/webhooks/librato/doc.md

@@ -1,21 +1,29 @@
-Get Zulip notifications for your Librato/AppOptics alerts!
+# Zulip AppOptics/Librato integration
+
+Get Zulip notifications for your AppOptics/Librato alerts!
+
+{start_tabs}
 
 1. {!create-channel.md!}
 
 1. {!create-an-incoming-webhook.md!}
 
-1. {!generate-integration-url.md!}
-   By default, the integration will use the name of the alert.
+1. {!generate-webhook-url-basic.md!}
 
-1. Go to your AppOptics/Librato homepage, and click on **Settings**
-   on the left. Select **Notification Services**, and click on
-   **Webhooks**.
+1. Go to your AppOptics/Librato homepage, and click on **Settings**.
+   Select **Notification Services**, and click **Webhooks**.
 
 1. Set **Title** to a title of your choice, such as `Zulip`. Set **URL**
-   to the URL constructed above, and click **Add**. When you create a
+   to the URL generated above, and click **Add**. When you create a
    new **Alert**, you can enable this webhook under the **Notification
    Services** tab.
 
+{end_tabs}
+
 {!congrats.md!}
 
 ![](/static/images/integrations/librato/001.png)
+
+### Related documentation
+
+{!webhooks-url-specification.md!}