Add a label

Author: NataliaIvakina

modules/ROOT/pages/backup-restore/online-backup.adoc

@@ -163,7 +163,7 @@ Note: this is an EXPERIMENTAL option. Consult Neo4j support before use.
 |false
 
 |--prefer-diff-as-parent
-|When performing a differential backup, prefer the latest not-empty differential backup as parent instead of the latest full backup.
+|label:new[Introduced in 2025.04] When performing a differential backup, prefer the latest not-empty differential backup as parent instead of the latest full backup.
 |false
 
 |--temp-path=<path>