Update _toc.yml

Author: ebatty

_toc.yml

@@ -86,11 +86,11 @@ parts:
       - file: Week10/Video103.ipynb 
       - file: Week10/Week10Tutorial1.ipynb 
       - file: Week10/Week10Tutorial2.ipynb 
-  #   - file: Week11/Overview.md
-  #     sections:
-  #     - file: Week11/Video111.ipynb
-  #     - file: Week11/Video112.ipynb
-  #     - file: Week11/Video113.ipynb 
+    - file: Week11/Overview.md
+      sections:
+      - file: Week11/Video111.ipynb
+      - file: Week11/Video112.ipynb
+      - file: Week11/Video113.ipynb 
   #     - file: Week11/Week11Tutorial1.ipynb 
   #     - file: Week11/Week11Tutorial2.ipynb 
   #   - file: Week12/Overview.md