grails.gorm.flushMode wrong default value

Default value for grails.gorm.flushMode was changed from AUTO to COMMIT in GORM 6.1, but this was not fixed in the docs as well. Candidate fix for grails#514

docs/src/docs/asciidoc/configuration/configurationReference.adoc

@@ -3,7 +3,7 @@ You can refer to the link:../api/org/grails/orm/hibernate/connections/HibernateC
 [format="csv", options="header"]
 |===
 name,description,default value
-`grails.gorm.flushMode`, The flush mode to use, `AUTO`
+`grails.gorm.flushMode`, The flush mode to use, `COMMIT`
 `grails.gorm.failOnError`, Whether to throw an exception on validation error, `false`
 `grails.gorm.default.mapping`,The default mapping to apply to all classes, `null`
 `grails.gorm.default.constraints`,The default constraints to apply to all classes, `null`