patch https://api.codepost.io/rubricComments/
Behavior
Updates the specified rubric comment by setting the values of the parameters passed. Any parameters not provided will be left unchanged. If the pointDelta field is updated, the grade field of all Submissions containing Comments linked to this rubric comment will be updated (subject to the category.pointLimit).
Returns
Returns the updated rubric comment if the update succeeded. This call will raise an error if update parameters are invalid.