Clarify scope/definition of Cumulative Credits in StudentAcademicRecord

The definition for StudentAcademicRecord.CumulativeAttemptedCredits implies that this is a record of all credits for the student's career at that institution 

The cumulative number of credits an individual attempts to earn by taking courses during his or her enrollment in the current school as well as those credits transferred from schools in which the individual had been previously enrolled

However, it would be good to make that more explicit.