[release-11.5.3] Alerting docs: fix heading anchor (#100959)

Alerting docs: fix heading anchor (#100783)

Co-authored-by: Jack Baldry <jack.baldry@grafana.com>
(cherry picked from commit 8646961c3f)

Co-authored-by: Pepe Cano <825430+ppcano@users.noreply.github.com>

docs/sources/alerting/configure-notifications/manage-contact-points/integrations/webhook-notifier.md

@@ -50,7 +50,7 @@ To create a contact point with webhook integration, complete the following steps
 1. Enter a name for the contact point.
 1. From the **Integration** list, select **Webhook**.
 1. In the **URL** field, copy in your Webhook URL.
-1. (Optional) Configure [additional settings](#settings).
+1. (Optional) Configure [additional settings](#webhook-settings).
 1. Click **Save contact point**.
 
 For more details on contact points, including how to test them and enable notifications, refer to [Configure contact points](ref:configure-contact-points).