Updates to language about Graded and Ungraded stuff

Hello Deb - Per our earlier convo. Thanks!

1. With regard to any Grading Policy related articles, avoid using "ungraded" as an example of an assignment type "that counts towards learners' grades." If its ungraded, it simply does not (and should not) come up in the grading policy.

8.4.1.1. Adding Graded or Ungraded Problems
Original: "When you establish the grading policy for your course, you define the assignment types that count toward learners’ grades: for example, homework, labs, midterm, final, and ungraded. You specify one of these assignment types for each of the subsections in your course."
Proposed replacement for underlined term: "participation"

Also, "For example, all of the problem components that you add to a unit in an ungraded subsection are ungraded, all of the problem components that you add to a unit in the midterm subsection are graded, and so on."

2. The following is no longer true in the navigation (course outline): "an icon of a pen and a piece of paper is shown for that assignment in the course navigation pane."

8.4.2. The Learner View of a Problem

I'll continue to add to this story as I notice more. -Ben