DERBY-6588: Add SQL Standard feature number for WHEN clause in trigger to 10.11.1 release summary; commit derby-6588-04-aa-addFeatureNumberForWHENclause.diff.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1602898 13f79535-47bb-0310-9956-ffa450edef68