Git commits in Moodle 3.9.0 by Mike Churchward

commit 9e8e75a05a1a618f5288ed54e6421a696ab61cd0
Author: Mike Churchward <mike.churchward@poetgroup.org>
Date:   Fri, 29 May 2020 09:51:50 +0800
Tag:    v3.9.0-beta

MDL-68866 accesslib: Fixing parameter documentation.

commit b677d33d628afe631f84d3421c84318a80d68a63
Author: Mike Churchward <mike.churchward@poetgroup.org>
Date:   Fri, 01 May 2020 01:20:50 +0800
Tag:    v3.9.0-beta

MDL-68568 editor-atto: Move 'indent' next to 'lists' by default.

commit 7e03b27dd9302ab401465be51967229696d37aad
Author: Mike Churchward <mike.churchward@poetgroup.org>
Date:   Wed, 29 Apr 2020 23:41:33 +0800
Tag:    v3.9.0-beta

MDL-68541 editor-atto: Limiting alt text length, changing ignore text.