CNV-30815: Update OpenShift doc for GC disabled by default

Author: danielclowers

modules/virt-about-datavolumes.adoc

@@ -23,5 +23,3 @@
 ====
 * VM disk PVCs that are prepared by using standalone data volumes maintain an independent lifecycle from the VM. If you use the `dataVolumeTemplate` field in the VM specification to prepare the PVC, the PVC shares the same lifecycle as the VM.
 ====
-
-After a PVC is populated, the data volume that you used to create the PVC is no longer needed. {VirtProductName} enables automatic garbage collection of completed data volumes by default. Standalone data volumes, and data volumes created by using the `dataVolumeTemplate` resource, are automatically garbage collected after completion.