Try fixing compile error in docs

Blaisorblade · Blaisorblade · commit fbcb64023b9f · 2019-01-29T22:13:43.000+01:00
http://dotty-ci.epfl.ch/lampepfl/dotty/10144/6
diff --git a/docs/sidebar.yml b/docs/sidebar.yml
@@ -68,6 +68,7 @@ sidebar:
             - title: Kind Polymorphism
               url: docs/reference/other-new-features/kind-polymorphism.html
         - title: New Implicits
+          subsection:
             - title: Instance Definitions
               url: docs/reference/instances/instance-defs.html
             - title: Context Parameters
