KEP-5339: fix typo in ClusterProfile credentialProviders example

Signed-off-by: kahirokunn <[email protected]>
Co-authored-by: Stephen Kitt <[email protected]>

Author: kahirokunn

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

@@ -312,9 +312,9 @@ status:
    - name: location
      value: us-central1
   credentialProviders:
-    google:
-      cluster:
-        server: https://connectgateway.googleapis.com/v1/projects/123456789/locations/us-central1/gkeMemberships/my-cluster-1
+  - name: google
+    cluster:
+      server: https://connectgateway.googleapis.com/v1/projects/123456789/locations/us-central1/gkeMemberships/my-cluster-1
 ```