Clarify neo4j-admin server report --database option (#1946) (#1950)

Cherry-picked from #1946

Author: renetapopova

modules/ROOT/pages/tools/neo4j-admin/neo4j-admin-report.adoc

@@ -32,6 +32,12 @@ You can generate a report covering all databases in the DBMS, a specific databas
 For example, if you run the command `neo4j-admin server report --database=ne*`, a report will be generated for all databases that start with "ne".
 If not specified, the tool generates a report for all databases in the DBMS.
 
+[NOTE]
+====
+The `--database` option determines from which database(s) the database-level information is collected.
+It does not influence the DBMS-level information, which is gathered based on the specified classifiers.
+====
+
 This tool does not send any information automatically.
 To share this information with the Neo4j Support organization, you have to send it manually.