fix vale error

Author: guowenatk

vcluster/_fragments/sync-from-host-resources.mdx

@@ -35,7 +35,9 @@ Namespaced resources are materialized in the virtual cluster if they don’t alr
 <!-- vale on -->
 * [Events](../configure/vcluster-yaml/sync/from-host/events.mdx)
 
+<!-- vale off -->
 ### Disabled by default
+<!-- vale on -->
 * [CustomResources](../configure/vcluster-yaml/sync/from-host/custom-resources.mdx)
 * [Nodes](../configure/vcluster-yaml/sync/from-host/nodes.mdx)
 * [IngressClasses](../configure/vcluster-yaml/sync/from-host/ingress-classes.mdx)