integration-docs: Update Bitbucket Cloud SAAS for new doc format.

Part of #29592.

zerver/webhooks/bitbucket2/doc.md

@@ -1,3 +1,5 @@
+# Zulip Bitbucket integration
+
 Zulip supports both Git and Mercurial notifications from
 Bitbucket. This integration is for the new-style Bitbucket
 webhooks used by the Bitbucket SAAS service.
@@ -6,21 +8,38 @@ For the old-style Bitbucket webhooks used by Bitbucket Enterprise,
 click [here](./bitbucket), and for the new-style webhooks used by
 Bitbucket Server click [here](./bitbucket3).
 
+{start_tabs}
+
 1. {!create-channel.md!}
 
 1. {!create-an-incoming-webhook.md!}
 
-1. {!generate-integration-url.md!}
+1. {!generate-webhook-url-basic.md!}
 
-    {!git-webhook-url-with-branches.md!}
-
-1. On your repository's web page, click on **Settings**. Select
-   **Webhooks**, and click **Add webhook**.
+1. On your repository's web page, go to **Settings**. Select
+   **Webhooks**, and then click **Add webhook**.
 
 1. Set **Title** to a title of your choice, such as `Zulip`. Set **URL**
-   to the URL constructed above, and check the **Active** checkbox. Select
-   the **Triggers** you'd like to be notified about, and click **Save**.
+   to the URL generated above, and toggle the **Active** checkbox.
+   Select the **Triggers** you'd like to be notified about, and click
+   **Save**.
+
+{end_tabs}
 
 {!congrats.md!}
 
 ![](/static/images/integrations/bitbucket/003.png)
+
+{% if all_event_types is defined %}
+
+{!event-filtering-additional-feature.md!}
+
+{% endif %}
+
+### Configuration options
+
+{!git-branches-additional-feature.md!}
+
+### Related documentation
+
+{!webhooks-url-specification.md!}