Update runtime-classes.mdx

Author: joaniekube

vcluster/configure/vcluster-yaml/sync/from-host/runtime-classes.mdx

@@ -99,7 +99,7 @@ When vCluster removes a synced RuntimeClass from the virtual cluster due to sele
 
 To sync only RuntimeClass resources labeled `environment: development`:
 
-```yaml
+```yaml title="Filter example runtimeClass"
 sync:
   toHost:
     pods:
@@ -116,7 +116,7 @@ sync:
 
 To sync RuntimeClass resources where the label `kubernetes.io/runtime.class` is either `gvisor` or `youki`:
 
-```yaml
+```yaml title="Flexible filter example runtimeClass"
 sync:
   toHost:
     pods:
@@ -137,7 +137,7 @@ sync:
 
 The following configuration syncs RuntimeClass resources that match both label and expression criteria:
 
-```yaml
+```yaml title="Combined filter example runtimeClass"
 sync:
   toHost:
     pods:
@@ -160,7 +160,7 @@ sync:
 
 When a Pod resource references a RuntimeClass that doesn't match the selector criteria, the error output looks like this:
 
-```bash
+```bash title="Error handling example runtimeClass"
 vcluster-virtual-cluster-1:~$ kubectl describe pod my-pod
 Name:             my-pod
 Namespace:        default