DERBY-6588: Check in release notes for the 2nd release candidate for 10.11.1; commit derby-6588-10-aa-releaseNotesForRC2.diff.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/branches/10.11@1616542 13f79535-47bb-0310-9956-ffa450edef68