Fix typo for OpenAPIV3 and OpenAPIEnums

If a user were to copy & paste from the docs into the feature-gate option they would receive the error `flag: unrecognized feature gate: OpenAPIv3` or `flag: unrecognized feature gate: OpenAPIEnum`. This change uses the correct case for `V` and uses the plural form for `Enums` as the command line parser expects.

Author: Alex Zielenski

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

@@ -167,8 +167,8 @@ different Kubernetes components.
 | `NodeSwap` | `false` | Alpha | 1.22 | |
 | `NonPreemptingPriority` | `false` | Alpha | 1.15 | 1.18 |
 | `NonPreemptingPriority` | `true` | Beta | 1.19 | |
-| `OpenAPIEnum` | `false` | Alpha | 1.23 | |
-| `OpenAPIv3` | `false` | Alpha | 1.23 | |
+| `OpenAPIEnums` | `false` | Alpha | 1.23 | |
+| `OpenAPIV3` | `false` | Alpha | 1.23 | |
 | `PodAndContainerStatsFromCRI` | `false` | Alpha | 1.23 | |
 | `PodAffinityNamespaceSelector` | `false` | Alpha | 1.21 | 1.21 |
 | `PodAffinityNamespaceSelector` | `true` | Beta | 1.22 | |
@@ -914,9 +914,9 @@ Each feature gate is designed for enabling/disabling a specific feature:
   Must be used with `KubeletConfiguration.failSwapOn` set to false.
   For more details, please see [swap memory](/docs/concepts/architecture/nodes/#swap-memory)
 - `NonPreemptingPriority`: Enable `preemptionPolicy` field for PriorityClass and Pod.
-- `OpenAPIEnum`: Enables populating "enum" fields of OpenAPI schemas in the 
+- `OpenAPIEnums`: Enables populating "enum" fields of OpenAPI schemas in the 
   spec returned from the API server.
-- `OpenAPIv3`: Enables the API server to publish OpenAPI v3.
+- `OpenAPIV3`: Enables the API server to publish OpenAPI v3.
 - `PVCProtection`: Enable the prevention of a PersistentVolumeClaim (PVC) from
   being deleted when it is still used by any Pod.
 - `PodDeletionCost`: Enable the [Pod Deletion Cost](/docs/concepts/workloads/controllers/replicaset/#pod-deletion-cost)