integration-docs: Update Pingdom to the new doc format.

Replaced the image to show **Add Integration** with text
instructions.

Part of #29592.

zerver/lib/integrations.py

@@ -791,7 +791,7 @@ DOC_SCREENSHOT_CONFIG: dict[str, list[BaseScreenshotConfig]] = {
     "pagerduty": [ScreenshotConfig("trigger_v2.json")],
     "papertrail": [ScreenshotConfig("short_post.json", payload_as_query_param=True)],
     "patreon": [ScreenshotConfig("members_pledge_create.json")],
-    "pingdom": [ScreenshotConfig("http_up_to_down.json", image_name="002.png")],
+    "pingdom": [ScreenshotConfig("http_up_to_down.json", image_name="001.png")],
     "pivotal": [ScreenshotConfig("v5_type_changed.json")],
     "radarr": [ScreenshotConfig("radarr_movie_grabbed.json")],
     "raygun": [ScreenshotConfig("new_error.json")],

zerver/webhooks/pingdom/doc.md

@@ -1,24 +1,35 @@
+# Zulip Pingdom integration
+
 Zulip supports integration with Pingdom and can notify you of
 uptime status changes from your Pingdom dashboard.
 
+{start_tabs}
+
 1. {!create-channel.md!}
 
 1. {!create-an-incoming-webhook.md!}
 
-1. {!generate-integration-url.md!}
+1. {!generate-webhook-url-basic.md!}
 
-1. Next, go to the following URL:
+1. In Pingdom, open the **Integrations** menu, and click
+   **Add integration**.
 
-    `https://my.pingdom.com/reports/integration/settings`
+1. For **Type**, select **Webhook**. Set **Name** to a name of your
+   choice, like `Zulip`, and set **URL** to the URL generated above.
+   Make sure **Active** is toggle, and click **Save integration**.
 
-1. Create your integration by clicking on the **Add Integration** button
+1. Finally, when creating a new check or editing an existing check,
-    and filling the form like so:
+   toggle the integration created above in the **Connect Integrations**
+   section for that check.
 
-    ![](/static/images/integrations/pingdom/001.png)
+{end_tabs}
-
-1. Last, during creating or editing your check, scroll down to
-    **Connect Integrations** section and ensure your integration is checked.
 
 {!congrats.md!}
 
-![](/static/images/integrations/pingdom/002.png)
+![](/static/images/integrations/pingdom/001.png)
+
+{!event-filtering-additional-feature.md!}
+
+### Related documentation
+
+{!webhooks-url-specification.md!}