- Move 'upgrading from previous version' section above the 'detailed change list' super-section
- Put parens around 'Elran Dvir via Erick Erickson' so that it gets recognized as an attribution
(merged trunk r1542019)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1542021 13f79535-47bb-0310-9956-ffa450edef68