Add Ref to shared process namespaces (kubernetes#14194)

* Add Ref to shared process namespaces

The article talking about ways container can talk to each other should include shared process namespace as a method

* Drop note on kube version in reference

content/en/docs/tasks/access-application-cluster/communicate-containers-same-pod-shared-volume.md

@@ -7,7 +7,7 @@ weight: 110
 {{% capture overview %}}
 
 This page shows how to use a Volume to communicate between two Containers running
-in the same Pod.
+in the same Pod. See also how to allow processes to communicate by [sharing process namespace](/docs/tasks/configure-pod-container/share-process-namespace/) between containers.
 
 {{% /capture %}}
 
@@ -141,6 +141,8 @@ the shared Volume is lost.
 * See
 [Configuring a Pod to Use a Volume for Storage](/docs/tasks/configure-pod-container/configure-volume-storage/).
 
+* See [Configure a Pod to share process namespace between containers in a Pod](/docs/tasks/configure-pod-container/share-process-namespace/)
+
 * See [Volume](/docs/reference/generated/kubernetes-api/{{< param "version" >}}/#volume-v1-core).
 
 * See [Pod](/docs/reference/generated/kubernetes-api/{{< param "version" >}}/#pod-v1-core).