Update _config.yml

Author: skyil7

docs/_config.yml

@@ -306,6 +306,7 @@ es:
         - path: es/week12/12-2.md
         - path: es/week12/12-3.md
     - path: es/week13/13.md
+      sections:
         - path: es/week13/13-1.md
     - path: es/week14/14.md
       sections:
@@ -523,4 +524,4 @@ fr:
       sections:
         - path: fr/week12/12-1.md
         - path: fr/week12/12-2.md
-        - path: fr/week12/12-3.md
+        - path: fr/week12/12-3.md