integration-docs: Update Radarr for new doc format.

Part of zulip#29592.

zerver/webhooks/radarr/doc.md

@@ -1,24 +1,34 @@
+# Zulip Radarr integration
+
 Receive Radarr 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!}
 
-1. Go to your Radarr dashboard. Click **Settings** and click **Connect**.
+1. Go to your Radarr dashboard. Open **Settings**, and select **Connect**.
-    Click the **+** icon.
+    Click the plus (**+**) icon.
 
-1. Select **Webhook** and set the name of the webhook to any name of your
+1. Select **Webhook**, and set the name of the webhook to any name of your
-    choice (e.g **Zulip**). Select the scenarios you would like to receive
+    choice, such as `Zulip`. Select the scenarios you would like to receive
     notifications for. You may also enter tags if you would like to be
     notified about movies with specific tags.
 
-1. Set **URL** to the **URL** constructed above. Set **Method** to **POST**
+1. Set **URL** to the URL generated above, and set **Method** to
-    and leave the **Username** and **Password** fields blank.
+    **POST**. Leave the **Username** and **Password** fields blank. Click **Save**, which will send a test message to Zulip.
 
-1. Click **Save** and you should receive a test message.
+{end_tabs}
 
 {!congrats.md!}
 
 ![](/static/images/integrations/radarr/001.png)
+
+{!event-filtering-additional-feature.md!}
+
+### Related documentation
+
+{!webhooks-url-specification.md!}