Update keps/sig-multicluster/5339-clusterprofile-plugin-credentials/README.md

Co-authored-by: Corentin Debains <[email protected]>

Author: kahirokunn

keps/sig-multicluster/5339-clusterprofile-plugin-credentials/README.md

@@ -298,7 +298,7 @@ Some credential providers require cluster-specific, non-secret parameters (for e
 
 > Optional: when a plugin needs per-cluster, non-secret config, set an extension entry with `name: client.authentication.k8s.io/exec` under `Cluster.extensions`.
 - The library reads only the `extension` field of that entry and passes it through verbatim to `ExecCredential.Spec.Cluster.Config`.
-- The content must be non-secret and cluster-specific. Controller- or environment-specific data must not be placed here.
+> The content must be non-secret and cluster-specific. Controller- or environment-specific data must not be placed here.
 - Plugins may read values (e.g. `clusterName`) from `ExecCredential.Spec.Cluster.Config`.
 
 Reference: [client.authentication.k8s.io/v1 Cluster: `config` sourced from `extensions[client.authentication.k8s.io/exec]`](https://kubernetes.io/docs/reference/config-api/client-authentication.v1/#client-authentication-k8s-io-v1beta1-Cluster)