SOLR-6323: Updated CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_10@1640266 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6684: Updated CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_10@1640267 13f79535-47bb-0310-9956-ffa450edef68