Fix error in docs, required field was marked optional (#2225)

Author: rafed

website/docs/d/persistent_volume_claim.html.markdown

@@ -35,7 +35,7 @@ The following arguments are supported:
 
 #### Arguments
 
-* `name` - (Optional) Name of the persistent volume claim, must be unique. Cannot be updated. For more info see [Kubernetes reference](https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names)
+* `name` - (Required) Name of the persistent volume claim, must be unique. Cannot be updated. For more info see [Kubernetes reference](https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names)
 * `namespace` - (Optional) Namespace defines the space within which name of the persistent volume claim must be unique.
 
 #### Attributes

website/docs/d/persistent_volume_claim_v1.html.markdown

@@ -35,7 +35,7 @@ The following arguments are supported:
 
 #### Arguments
 
-* `name` - (Optional) Name of the persistent volume claim, must be unique. Cannot be updated. For more info see [Kubernetes reference](https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names)
+* `name` - (Required) Name of the persistent volume claim, must be unique. Cannot be updated. For more info see [Kubernetes reference](https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names)
 * `namespace` - (Optional) Namespace defines the space within which name of the persistent volume claim must be unique.
 
 #### Attributes