Clarify that consistency check is not supported for diff backups (#2515)

Author: NataliaIvakina

modules/ROOT/pages/backup-restore/consistency-checker.adoc

@@ -2,7 +2,7 @@
 [[consistency-checker]]
 = Check database consistency
 
-You can use the `neo4j-admin database check` command to check the consistency of a database, a dump, or a backup.
+You can use the `neo4j-admin database check` command to check the consistency of a database, a dump, or a full backup.
 The `neo4j-admin` tool is located in the _/bin_ directory.
 
 == Syntax
@@ -22,15 +22,15 @@ neo4j-admin database check [-h] [--expand-commands] [--force] [--verbose]
 
 === Description
 
-This command allows for checking the consistency of a database, a dump, or a backup.
+This command allows for checking the consistency of a database, a dump, or a full backup.
 It cannot be used with a database that is currently in use.
 
 Some checks can be quite expensive, so it may be useful to turn some of them off for very large databases.
 Increasing the heap size might be a good idea.
 
 [NOTE]
 ====
-It is not recommended to use an NFS to check the consistency of a database, a dump, or a backup as this slows the process down significantly.
+It is not recommended to use an NFS to check the consistency of a database, a dump, or a full backup as this slows the process down significantly.
 ====
 
 === Parameters
@@ -199,6 +199,12 @@ Consistency check
 
 === Check the consistency of a backup/dump
 
+[NOTE]
+====
+Note that consistency check is not supported for differential backups.
+The backup chain must be aggregated into a full backup artifact before running consistency check.
+====
+
 Run with the `--from-path` option to check the consistency of a backup or a dump:
 
 [source,shell]
@@ -209,7 +215,7 @@ bin/neo4j-admin database check --from-path=<directory-with-backup-or-dump> neo4j
 [[check-database-from-cloud-uris]]
 === Check the consistency of a backup/dump stored in a cloud storage
 
-The following examples show how to check the consistency of a backup or a dump stored in a cloud storage bucket using the `--from-path` option.
+The following examples show how to check the consistency of a full backup or a dump stored in a cloud storage bucket using the `--from-path` option.
 
 [.tabbed-example]
 =====