fix link

Author: guowenatk

platform/use-platform/virtual-clusters/add-virtual-clusters.mdx

@@ -134,7 +134,7 @@ vcluster platform add vcluster [[VAR:VCLUSTER_NAME:vc-name]] \\
 />
 
 You can also use Helm values by updating the `vcluster.yaml` to include the access key of the platform and then upgrade or restart
-the virtual cluster. More information can be found at the [`apiKey` configuration section of vCluster.](../../../vcluster/configure/vcluster-yaml/external/platform/api-key)
+the virtual cluster. More information can be found at the [`apiKey` configuration section of vCluster.](../../../../vcluster/configure/vcluster-yaml/external/platform/api-key)
 
 ### Helm wrapper for VirtualClusterInstance