_slides: E grade on research project required for 4.0

_slides/about/introduction/grading.md

@@ -9,7 +9,7 @@ All submitted work in this course is graded on a **Satisfactory (S)** or **Not y
 : **S** on all 3 projects.
 : **S** on all 6 checkpoints.
 : **S** on the portfolio.
-: **S** on the research project.
+: **E** (exemplary) on the research project.
 
 3.0
 : **S** on all 3 projects.