Promote ExpandedDNSConfig feature to the beta stage

Author: gjkim42

content/en/docs/concepts/services-networking/dns-pod-service.md

@@ -315,7 +315,7 @@ options ndots:5
 
 #### Expanded DNS Configuration
 
-{{< feature-state for_k8s_version="1.22" state="alpha" >}}
+{{< feature-state for_k8s_version="1.26" state="beta" >}}
 
 By default, for Pod's DNS Config, Kubernetes allows at most 6 search domains and
 a list of search domains of up to 256 characters.
@@ -324,6 +324,11 @@ If the feature gate `ExpandedDNSConfig` is enabled for the kube-apiserver and
 the kubelet, it is allowed for Kubernetes to have at most 32 search domains and
 a list of search domains of up to 2048 characters.
 
+{{< note >}}
+[Expanded DNS Configuration](https://github.com/kubernetes/enhancements/tree/master/keps/sig-network/2595-expanded-dns-config#notesconstraintscaveats-optional)
+requires container runtime support.
+{{< /note >}}
+
 ## DNS resolution on Windows nodes {#dns-windows}
 
 - ClusterFirstWithHostNet is not supported for Pods that run on Windows nodes.

content/en/docs/reference/command-line-tools-reference/feature-gates.md

@@ -99,7 +99,8 @@ different Kubernetes components.
 | `DownwardAPIHugePages` | `true` | Beta | 1.22 | |
 | `EndpointSliceTerminatingCondition` | `false` | Alpha | 1.20 | 1.21 |
 | `EndpointSliceTerminatingCondition` | `true` | Beta | 1.22 | |
-| `ExpandedDNSConfig` | `false` | Alpha | 1.22 | |
+| `ExpandedDNSConfig` | `false` | Alpha | 1.22 | 1.25 |
+| `ExpandedDNSConfig` | `true` | Beta | 1.26 | |
 | `ExperimentalHostUserNamespaceDefaulting` | `false` | Beta | 1.5 | |
 | `GracefulNodeShutdown` | `false` | Alpha | 1.20 | 1.20 |
 | `GracefulNodeShutdown` | `true` | Beta | 1.21 | |
@@ -896,7 +897,7 @@ Each feature gate is designed for enabling/disabling a specific feature:
 - `ExpandCSIVolumes`: Enable the expanding of CSI volumes.
 - `ExpandedDNSConfig`: Enable kubelet and kube-apiserver to allow more DNS
   search paths and longer list of DNS search paths. This feature requires container
-  runtime support(Containerd: v1.5.6 or higher, CRI-O: v1.22 or higher). See
+  runtime support (for containerd: v1.5.6 or higher; CRI-O: v1.22 or higher). See
   [Expanded DNS Configuration](/docs/concepts/services-networking/dns-pod-service/#expanded-dns-configuration).
 - `ExpandInUsePersistentVolumes`: Enable expanding in-use PVCs. See
   [Resizing an in-use PersistentVolumeClaim](/docs/concepts/storage/persistent-volumes/#resizing-an-in-use-persistentvolumeclaim).