Reword PodPreset concept

- Note feature state for PodPreset
- Emphasize section on enabling PodPreset
- Omit version check
  Assume that the reader has a supported version of Kubernetes that
  includes PodPreset.
- List PodPreset as a task prerequisite
  PodPreset is an alpha feature; you can't follow the task page unless
  it's enabled.

content/en/docs/tasks/inject-data-application/podpreset.md

@@ -2,20 +2,23 @@
 reviewers:
 - jessfraz
 title: Inject Information into Pods Using a PodPreset
-min-kubernetes-server-version: v1.10
+min-kubernetes-server-version: v1.6
 content_template: templates/task
 weight: 60
 ---
 
 {{% capture overview %}}
 
+{{< feature-state for_k8s_version="v1.6" state="alpha" >}}
+
 This page shows how to use PodPreset objects to inject information like {{< glossary_tooltip text="Secrets" term_id="secret" >}}, volume mounts, and {{< glossary_tooltip text="environment variables" term_id="container-env-variables" >}} into Pods at creation time.
 
 {{% /capture %}}
 
 {{% capture prerequisites %}}
 
-{{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
+You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one using [Minikube](/docs/setup/learning-environment/minikube/).
+Make sure that you have [enabled PodPreset](/docs/concepts/workloads/pods/podpreset/#enable-pod-preset) in your cluster.
 
 {{% /capture %}}