Fix ResourceSlice example

Author: claudiolor

docs/advanced/peering/peering-via-cr.md

@@ -410,7 +410,7 @@ spec:
   providerClusterID: <PROVIDER_CLUSTER_ID>
   resources:
     cpu: 20
-    ram  128Gi
+    ram: 128Gi
 ```
 
 If the request above is successfully accepted by the provider, a new (virtual) node, impersonating the provider cluster, will make available the requested resorces on the consumer cluster.