document QUEUE parameter to CREATE TRIGGER

h2/src/docsrc/help/help.csv

@@ -640,6 +640,8 @@ Committing or rolling back a transaction within a trigger is not allowed, except
 By default a trigger is called once for each statement, without the old and new rows.
 FOR EACH ROW triggers are called once for each inserted, updated, or deleted row.
 
+QUEUE is implemented for syntax compatibility with HSQL and has no effect.
+
 The trigger need to be created in the same schema as the table.
 The schema name does not need to be specified when creating the trigger.