[AAA551] Update lec6

Author: jhnaldo

_data/course/aaa551/2026_1.yml

@@ -42,8 +42,8 @@ parts:
     - index: 6
       date: 03/24
       title: Fixed-Point Theory
-      # pdf: slides/lec6.pdf
-      # handout: slides/lec6-handout.pdf
+      pdf: slides/lec6.pdf
+      handout: slides/lec6-handout.pdf
     - index: 7
       date: 03/26
       title: Abstract Machines