Add a notes box for admin updates to explain why the update was made

There are times in LMS where updates are made to courses from another database to complete courses in LMS. Going in to LMS and completing a class for someone using the objective evidence from a prior completion seems fine, but it does not allow a space for the explanation of why the update was made. It would be nice to have a place that will allow the admin to make comments and direct any future reviewers to the objective evidence location. If a review happens a year later, the LMS updater may not remember why a change was made without available notes.