Update _toc.yml

Author: ebatty

_toc.yml

@@ -69,7 +69,7 @@ parts:
       - file: Week8/Video81.ipynb
       - file: Week8/Video82.ipynb
       - file: Week8/Week8Tutorial1.ipynb 
-  #     - file: Week8/Week8Tutorial2.ipynb 
+      - file: Week8/Week8Tutorial2.ipynb 
   # - caption: Machine Learning
   #   chapters:
   #   - file: Week9/Overview.md