Git commits in Moodle 3.8.0 by Elizabeth Dalton

commit 7229c5e6b5026916c1f981c65d271190383384ee
Author: Elizabeth Dalton <elizabeth@moodle.com>
Date:   Thu, 10 Oct 2019 05:58:36 +0800
Tag:    v3.8.0-beta

MDL-66592 analytics: Descriptions for indicator calculations