Add 3 to assign list.

Author: dvanhorn

www/assignments.scrbl

@@ -5,7 +5,7 @@
 
 @include-section{assignments/1.scrbl}
 @include-section{assignments/2.scrbl}
-@;include-section{assignments/3.scrbl}
+@include-section{assignments/3.scrbl}
 @;include-section{assignments/4.scrbl}
 @;include-section{assignments/5.scrbl}
 @;include-section{assignments/6.scrbl}