integration-docs: Update Linear for new doc format.

Part of #29592.

zerver/webhooks/linear/doc.md

@@ -1,20 +1,34 @@
+# Zulip Linear integration
+
 Get Linear notifications in Zulip!
 
+{start_tabs}
+
 1. {!create-channel.md!}
 
 1. {!create-an-incoming-webhook.md!}
 
-1. {!generate-integration-url.md!}
+1. {!generate-webhook-url-basic.md!}
 
-    You can refer to Linear's documentation for [webhook events](https://developers.linear.app/docs/graphql/webhooks).
-
-1. Go to your team on Linear and open **Settings**, select **API**,
+1. Go to your team on Linear, and open **Settings**. Select **API**,
    and click on **New Webhook**.
 
-1. Set **Webhook URL** to the URL constructed above. Select the data
-   change events for which you would like to receive notifications
-   for, and click **Create Webhook**.
+1. Set **Webhook URL** to the URL generated above. Select the **Data
+   change events** you'd like to receive notifications for, and click
+   **Create Webhook**.
+
+{end_tabs}
 
 {!congrats.md!}
 
 ![Linear Integration](/static/images/integrations/linear/001.png)
+
+{!event-filtering-additional-feature.md!}
+
+### Related documentation
+
+- [Linear webhook events documentation][linear-webhooks]
+
+{!webhooks-url-specification.md!}
+
+[linear-webhooks]: https://developers.linear.app/docs/graphql/webhooks