update docs with regard to --delete-backups limitations per pgbackrest volumes.
@@ -343,7 +343,9 @@ $ pgo delete cluster NAME|all [FLAGS]
|Name |Shorthand |Input |Usage
|`--delete-backups` |-b |N/A |
-Causes the backups for this cluster to be removed permanently.
+Causes the backups for this cluster to be removed permanently. This only
+is applicable with pgbasebackup backup volumes and does not remove
+pgbackrest repo volumes.
|`--delete-configs` |-b |N/A |
Causes the configuration maps for this cluster to be removed permanently.
