Git commits in Moodle 3.8.6 by Matt Clarkson

commit 4ac4c9a6c933e794328012a172c339852eca04d6
Author: Matt Clarkson <mattc@catalyst.net.nz>
Date:   Fri, 23 Oct 2020 11:06:36 +0800
Tag:    v3.8.6

MDL-68722 atto_equation: fix for form elements with special characters