Update link to default CR for NATS (#615)

Currently the link for the default CR which uses `NATS` backend is pointing to the one that has no backend. This PR fixes this.

docs/user/02-configuration.md

@@ -38,7 +38,7 @@ Warnings indicate that user action is required, that is, the user must install t
 
 Use the following sample CRs as guidance. Each can be applied immediately when you [install](../contributor/installation.md) Eventing Manager.
 
-- [Default CR - NATS backend](https://github.com/kyma-project/eventing-manager/blob/main/config/samples/default.yaml)
+- [Default CR - NATS backend](https://github.com/kyma-project/eventing-manager/blob/main/config/samples/default_nats.yaml)
 - [Default CR - EventMesh backend](https://github.com/kyma-project/eventing-manager/blob/main/config/samples/default_eventmesh.yaml)
 
 ## Reference