Added navigational link for ephemeral and persistent volume (#40785)

* Added navigational link for ephemeral and persistent volume

* Update volumes.md

Author: Niranjan Darshan

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

@@ -35,7 +35,8 @@ drivers, but the functionality is somewhat limited.
 
 Kubernetes supports many types of volumes. A {{< glossary_tooltip term_id="pod" text="Pod" >}}
 can use any number of volume types simultaneously.
-Ephemeral volume types have a lifetime of a pod, but persistent volumes exist beyond
+[Ephemeral volume](/docs/concepts/storage/ephemeral-volumes/) types have a lifetime of a pod, 
+but [persistent volumes](/docs/concepts/storage/persistent-volumes/) exist beyond
 the lifetime of a pod. When a pod ceases to exist, Kubernetes destroys ephemeral volumes;
 however, Kubernetes does not destroy persistent volumes.
 For any kind of volume in a given pod, data is preserved across container restarts.