SOLR-6015: Moving change note to 4.9 bugfix section.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1602950 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5956: Use getInstanceDir instead of getRawInstanceDir as that was causing issues when trying to create a backup of an index on Linux when solr.solr.home is a symbolic link.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1602953 13f79535-47bb-0310-9956-ffa450edef68