Add ExpandInUsePersistentVolumes feature gate (#9662)

* Add ExpandInUsePersistentVolumes feature gate

`ExpandInUsePersistentVolumes` is alpha in v1.11.

* Use relative link for ExpandInUsePersistentVolumes

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

@@ -58,6 +58,7 @@ different Kubernetes components.
 | `DynamicVolumeProvisioning` | `true` | Alpha | 1.3 | 1.7 |
 | `DynamicVolumeProvisioning` | `true` | GA | 1.8 | |
 | `EnableEquivalenceClassCache` | `false` | Alpha | 1.8 | |
+| `ExpandInUsePersistentVolumes` | `false` | Alpha | 1.11 | |
 | `ExpandPersistentVolumes` | `false` | Alpha | 1.8 | 1.10 |
 | `ExpandPersistentVolumes` | `true` | Beta | 1.11 | |
 | `ExperimentalCriticalPodAnnotation` | `false` | Alpha | 1.5 | |
@@ -182,6 +183,7 @@ Each feature gate is designed for enabling/disabling a specific feature:
 - `DynamicProvisioningScheduling`: Extend the default scheduler to be aware of volume topology and handle PV provisioning.
 - `DynamicVolumeProvisioning`(*deprecated*): Enable the [dynamic provisioning](/docs/concepts/storage/dynamic-provisioning/) of persistent volumes to Pods.
 - `EnableEquivalenceClassCache`: Enable the scheduler to cache equivalence of nodes when scheduling Pods.
+- `ExpandInUsePersistentVolumes`: Enable expanding in-use PVCs. See [Resizing an in-use PersistentVolumeClaim](/docs/concepts/storage/persistent-volumes/#resizing-an-in-use-persistentvolumeclaim).
 - `ExpandPersistentVolumes`: Enable the expanding of persistent volumes. See [Expanding Persistent Volumes Claims](/docs/concepts/storage/persistent-volumes/#expanding-persistent-volumes-claims).
 - `ExperimentalCriticalPodAnnotation`: Enable annotating specific pods as *critical* so that their [scheduling is guaranteed](/docs/tasks/administer-cluster/guaranteed-scheduling-critical-addon-pods/).
 - `ExperimentalHostUserNamespaceDefaultingGate`: Enabling the defaulting user