Documenting SCTP support in Kubernetes (#10279)

* Documenting SCTP support in Kubernetes Service, Endpoint, NetworkPolicy and Pod

* Updates based on comments on the PR

* kubectl expose update with SCTP support

* Updated according to comments in the PR

* Revert "kubectl expose update with SCTP support"

This reverts commit 0d5a1e6720a012390cf100c83e16b4a8c0782356.

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

@@ -93,6 +93,7 @@ different Kubernetes components.
 | `RotateKubeletServerCertificate` | `false` | Alpha | 1.7 | |
 | `RunAsGroup` | `false` | Alpha | 1.10 | |
 | `RuntimeClass` | `false` | Alpha | 1.12 | |
+| `SCTPSupport` | `false` | Alpha | 1.12 | |
 | `ServiceNodeExclusion` | `false` | Alpha | 1.8 | |
 | `StorageObjectInUseProtection` | `true` | Beta | 1.10 | 1.10 |
 | `StorageObjectInUseProtection` | `true` | GA | 1.11 | |
@@ -239,6 +240,7 @@ Each feature gate is designed for enabling/disabling a specific feature:
 - `RunAsGroup`: Enable control over the primary group ID set on the init processes of containers.
 - `RuntimeClass`: Enable the [RuntimeClass](/docs/concepts/containers/runtime-class/) feature for selecting container runtime configurations.
 - `ScheduleDaemonSetPods`: Enable DaemonSet Pods to be scheduled by the default scheduler instead of the DaemonSet controller.
+- `SCTPSupport`: Enables the usage of SCTP as `protocol` value in `Service`, `Endpoint`, `NetworkPolicy` and `Pod` definitions
 - `ServiceNodeExclusion`: Enable the exclusion of nodes from load balancers created by a cloud provider.
   A node is eligible for exclusion if annotated with "`alpha.service-controller.kubernetes.io/exclude-balancer`" key.
 - `StorageObjectInUseProtection`: Postpone the deletion of PersistentVolume or