Changes to query log docs w.r.t. GQL codes

Author: WilcoNeo

modules/ROOT/pages/monitoring/logging.adoc

@@ -1292,6 +1292,11 @@ The query log includes the GQL error information under the JSON object `errorInf
 * `position` -- The position (a JSON object containing a field for `column`, `offset`, and `line`) in the query where this error occurred.
 * `cause` -- A JSON object containing the `errorInfo` JSON object of the cause of the current `errorInfo` JSON object.
 
+GQLSTATUS code `50N42` is our default code. This code is shown when the exception does not have a GQL object yet.
+Neo4j version 5.25 started to add GQL objects to exceptions. Therefore, many `50N42` codes can be expected.
+Note: You should not rely on this default code, since future Neo4j versions might add an appropriate GQL object to the exception (therefore changing this code into another one).
+Also, GQL codes for external procedures are not stable yet.
+
 The following are examples of the `errorInfo` JSON object:
 
 .`errorInfo` JSON object of a database error