Fix broken implicit function type link on landing page

The page was renamed in 3bc0547

Author: Jentsch

docs/_includes/features.html

@@ -37,7 +37,7 @@ <h1 id="so-features">So, features?</h1>
                         <td>Implemented</td>
                     </tr>
                     <tr>
-                        <td><a href="http://dotty.epfl.ch/docs/reference/new-types/implicit-function-types.html">Implicit function types</a></td>
+                        <td><a href="http://dotty.epfl.ch/docs/reference/contextual/query-types.html">Implicit function types</a></td>
                         <td>Implemented</td>
                     </tr>
                     <tr>