Merge pull request #28239 from bridgetkromhout/correct-version-sctp-stable

SCTP is stable as of 1.20

Author: k8s-ci-robot

content/en/docs/concepts/services-networking/network-policies.md

@@ -212,9 +212,9 @@ This ensures that even pods that aren't selected by any other NetworkPolicy will
 
 ## SCTP support
 
-{{< feature-state for_k8s_version="v1.19" state="beta" >}}
+{{< feature-state for_k8s_version="v1.20" state="stable" >}}
 
-As a beta feature, this is enabled by default. To disable SCTP at a cluster level, you (or your cluster administrator) will need to disable the `SCTPSupport` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/) for the API server with `--feature-gates=SCTPSupport=false,…`.
+As a stable feature, this is enabled by default. To disable SCTP at a cluster level, you (or your cluster administrator) will need to disable the `SCTPSupport` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/) for the API server with `--feature-gates=SCTPSupport=false,…`.
 When the feature gate is enabled, you can set the `protocol` field of a NetworkPolicy to `SCTP`.
 
 {{< note >}}