Apply templates to all concepts and tasks to fix double bullets in TOC (#9149)

* Apply concept template to fix double bullet issue.

* Apply concept template

* Apply templates to tasks

content/en/docs/concepts/storage/persistent-volumes.md

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 - thockin
 - msau42
 title: Persistent Volumes
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 This document describes the current state of `PersistentVolumes` in Kubernetes. Familiarity with [volumes](/docs/concepts/storage/volumes/) is suggested.
 
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 ## Introduction
 
 Managing storage is a distinct problem from managing compute. The `PersistentVolume` subsystem provides an API for users and administrators that abstracts details of how storage is provided from how it is consumed. To do this we introduce two new API resources:  `PersistentVolume` and `PersistentVolumeClaim`.
@@ -608,3 +615,5 @@ and need persistent storage, we recommend that you use the following pattern:
   dynamic storage support (in which case the user should create a matching PV)
   or the cluster has no storage system (in which case the user cannot deploy
   config requiring PVCs).
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content/en/docs/concepts/storage/storage-classes.md

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 - thockin
 - msau42
 title: Storage Classes
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 This document describes the concept of `StorageClass` in Kubernetes. Familiarity
 with [volumes](/docs/concepts/storage/volumes/) and
 [persistent volumes](/docs/concepts/storage/persistent-volumes) is suggested.
 
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 ## Introduction
 
 A `StorageClass` provides a way for administrators to describe the "classes" of
@@ -670,3 +677,5 @@ specified by the `WaitForFirstConsumer` volume binding mode.
 Delaying volume binding allows the scheduler to consider all of a pod's
 scheduling constraints when choosing an appropriate PersistentVolume for a
 PersistentVolumeClaim.
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