integration-docs: Update Pivotal for new doc format.

Part of zulip#29592.

zerver/webhooks/pivotal/doc.md

@@ -1,18 +1,33 @@
+# Zulip Pivotal integration
+
 Get Zulip notifications for the stories in your Pivotal Tracker project!
 
+{start_tabs}
+
 1. {!create-channel.md!}
 
 1. {!create-an-incoming-webhook.md!}
 
-1. {!generate-integration-url.md!}
+1. {!generate-webhook-url-basic.md!}
 
-1. Go to your Pivotal project's **Settings** page, and click on **Webhooks**.
+1. From your Pivotal project's **Settings** page, click on **Webhooks**.
 
-1. Under **Activity Web Hook**, provide the URL constructed above.
-   Choose version 5 (`v5`) of the API. Zulip supports both version 3 and
-   version 5, but version 5 contains more information and allows
-   Zulip to format more useful messages. Click **Add**.
+1. Under **Activity Web Hook**, provide the URL generated above.
+   Choose version 5 (`v5`) of the API. Click **Add**.
+
+    !!! warn ""
+
+         **Note:** Zulip supports both version 3 and version 5, but version
+         5 contains more information and allows Zulip to format more useful messages.
+
+{end_tabs}
 
 {!congrats.md!}
 
 ![](/static/images/integrations/pivotal/001.png)
+
+{!event-filtering-additional-feature.md!}
+
+### Related documentation
+
+{!webhooks-url-specification.md!}