clarify about initial settings (#761)

Author: AlexicaWright

modules/ROOT/pages/administration/databases.adoc

@@ -612,7 +612,8 @@ Composite databases are always available on all servers.
 [NOTE]
 ====
 If `TOPOLOGY` is not specified, the database is created according to `initial.dbms.default_primaries_count` and `initial.dbms.default_secondaries_count` specified in _neo4j.conf_.
-After cluster startup, these values can be overwritten using the `dbms.setDefaultAllocationNumbers` procedure.
+
+Keep in mind that any setting with the `initial` prefix only applies on **first startup** and after this, these values can be overwritten using the `dbms.setDefaultAllocationNumbers` procedure.
 ====
 
 [role=enterprise-edition not-on-aura]