[COSE212] Update lec3

Author: jhnaldo

_data/course/cose212/2025_2.yml

@@ -30,11 +30,11 @@ parts:
     - index: 3
       date: 09/10
       title: Syntax and Semantics (2)
-      # pdf: slides/lec3.pdf
-      # handout: slides/lec3-handout.pdf
+      pdf: slides/lec3.pdf
+      handout: slides/lec3-handout.pdf
       homework:
         - name: ex01
-          # link: https://github.com/ku-plrg-classroom/docs/tree/main/cose212/ae
+          link: https://github.com/ku-plrg-classroom/docs/tree/main/cose212/ae
     - index: 4
       date: 09/15
       title: Identifiers (1)