Last batch change approvers to reviewers (#8644)

This is meant to be the last change for issue #7432.

Closes:# 7432

content/en/docs/tasks/administer-cluster/dns-debugging-resolution.md

@@ -1,5 +1,5 @@
 ---
-approvers:
+reviewers:
 - bowei
 - zihongz
 title:  Debugging DNS Resolution

content/en/docs/tasks/administer-cluster/kms-provider.md

@@ -1,5 +1,5 @@
 ---
-approvers:
+reviewers:
 - smarterclayton
 title: Using a KMS provider for data encryption
 content_template: templates/task

content/en/docs/tasks/administer-cluster/storage-object-in-use-protection.md

@@ -1,5 +1,5 @@
 ---
-approvers:
+reviewers:
 - msau42
 - jsafrane
 title: Storage Object in Use Protection

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

@@ -1,7 +1,7 @@
 ---
 title: Share Process Namespace between Containers in a Pod
 min-kubernetes-server-version: v1.10
-approvers:
+reviewers:
 - verb
 - yujuhong
 - dchen1107

content/en/docs/tasks/configure-pod-container/translate-compose-kubernetes.md

@@ -1,5 +1,5 @@
 ---
-approvers:
+reviewers:
 - cdrage
 title: Translate a Docker Compose File to Kubernetes Resources
 weight: 170