code: def update_course_descriptor_content(self, courseid, content):
          
          path = self._get_course_descriptor_path(courseid)
          self._filesystem.put(path, get_json_or_yaml(path, content))
docs: Updates the content of the dict that describes the course
          :param courseid: the course id of the course
          :param content: the new dict that replaces the old content
          :raise InvalidNameException, CourseNotFoundException