docs: add test webhook section (#1902)

apps/documentation/pages/developers/webhooks.mdx

@@ -619,6 +619,18 @@ Example payload for the `document.rejected` event:
 }
 ```
 
+## Webhook Events Testing
+
+You can trigger test webhook events to test the webhook functionality. To trigger a test webhook, navigate to the [Webhooks page](/developers/webhooks) and click on the "Test Webhook" button.
+
+![Documenso's Webhooks Page](/webhook-images/test-webhooks-page.webp)
+
+This opens a dialog where you can select the event type to test.
+
+![Documenso's individual webhook page](/webhook-images/test-webhook-dialog.webp)
+
+Choose the appropriate event and click "Send Test Webhook." You’ll shortly receive a test payload from Documenso with sample data.
+
 ## Availability
 
 Webhooks are available to individual users and teams.