SAK-25851 - removed CLE and modified some of the text.

git-svn-id: https://source.sakaiproject.org/svn/reference/trunk@307857 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-25851 - removed Link tool reference. Added Lessons and Signup tool.

git-svn-id: https://source.sakaiproject.org/svn/reference/trunk@307858 66ffb92e-73f9-0310-93c1-f5514f145a0a