Promote PodShareProcessNamespace to stable (#17192)

* Promote PodShareProcessNamespace to stable

* Add for_k8s_version to feature-state label

Co-Authored-By: Tim Bannister <tim@scalefactory.com>

* Readd version-check to shareProcessNamespace task

content/en/docs/tasks/configure-pod-container/share-process-namespace.md

@@ -11,7 +11,7 @@ weight: 160
 
 {{% capture overview %}}
 
-{{< feature-state state="beta" >}}
+{{< feature-state state="stable" for_k8s_version="v1.17" >}}
 
 This page shows how to configure process namespace sharing for a pod. When
 process namespace sharing is enabled, processes in a container are visible
@@ -27,9 +27,6 @@ include debugging utilities like a shell.
 
 {{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
 
-Process Namespace Sharing is a **beta** feature that is enabled by default. It
-may be disabled by setting `--feature-gates=PodShareProcessNamespace=false`.
-
 {{% /capture %}}
 
 {{% capture steps %}}