Make comments on example clearer
I actually struggled because I overlooked the fact that I needed to change the 2.1 to "A+".
So I wanted to make things clearer for future rustlings.
// However, the school also issues alphabetical grades (A+ -> F-) and needs
// to be able to print both types of report card!
-// Make the necessary code changes to support alphabetical report cards, thereby making
-// the second test pass.
+// Make the necessary code changes in the struct ReportCard and the impl block
+// to support alphabetical report cards. Change the Grade in the second test to "A+"
+// to show that your changes allow alphabetical grades.
+
+// Execute 'rustlings hint generics3' for hints!
// I AM NOT DONE
