Update _toc.yml

Author: mhjensen

doc/LectureNotes/_toc.yml

@@ -66,6 +66,8 @@ parts:
     - file: week46.ipynb
     - file: week47.ipynb
     - file: exercisesweek47.ipynb
+    - file: week48.ipynb
+    - file: exercisesweek48.ipynb
   - caption: Projects
     numbered: false
     chapters: