SAK-23907; Lessons still needs to build in 2.8 and 2.9


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/trunk@129907 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-23907; document Lessons change


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/trunk@129908 66ffb92e-73f9-0310-93c1-f5514f145a0a