fix(k8s): update requirements

Author: bene2k1

pages/kubernetes/how-to/monitor-data-plane-with-cockpit.mdx

@@ -27,7 +27,9 @@ This feature allows you to:
 <Macro id="requirements" />
 
 - A running [Kapsule](/kubernetes/how-to/create-cluster/) or [Kosmos](/kubernetes/how-to/create-kosmos-cluster/) cluster.
-- An API Key with [IAM permissions](/iam/reference-content/permission-sets/) to edit your cluster `(KubernetesFullAccess` or `KubernetesSystemMastersGroupAccess`)
+- An API Key with [IAM permissions](/iam/reference-content/permission-sets/) to:
+  - edit your cluster `(KubernetesFullAccess` or `KubernetesSystemMastersGroupAccess`)
+  - write on Cockpit (`ObservabilityFullAccess`)
 - [A token](/cockpit/how-to/create-token/) with permissions to push to, and query logs from Cockpit
 
 ## Architecture and limitations