Merge pull request #17510 from lamek/fix-comment-callout

updating a footnote

Author: Kevin Lamenzo

Diff for: modules/metering-configure-persistentvolumes.adoc

@@ -27,7 +27,7 @@ spec:
         storage:
           # Default is null, which means using the default storage class if it exists.
           # If you wish to use a different storage class, specify it here
-          # class: "fast-ssdl" <1>
+          # class: "null" <1>
           size: "5Gi"
 ----
 <1> Uncomment this line and replace `null` with the name of the StorageClass to use. Leaving the value `null` will cause metering to use the default StorageClass for the cluster.
@@ -48,7 +48,7 @@ spec:
         storage:
           # Default is null, which means using the default storage class if it exists.
           # If you wish to use a different storage class, specify it here
-          # class: "fast-ssd"
+          # class: "null"
           size: "5Gi" <1>
 ----
 <1> Replace the value for `size` with your desired capacity. The example file shows "5Gi".