Fix TODO in CONTRIBUTING.md

CONTRIBUTING.md

@@ -27,8 +27,8 @@ When making a code contribution to winit, before opening your pull request, plea
   maintainers and future contributors don't have to try to guess what your code is supposed to do
 - your PR adds an entry to the changelog file if the introduced change is relevant to winit users
 - if your PR affects the platform compatibility of one or more features or adds another feature, the
-  relevant table in the wiki should be updated
-  ***//TODO: LINKY***
+  relevant sections in [`FEATURES.md`](https://github.com/rust-windowing/winit/blob/master/FEATURES.md#features)
+  should be updated.
 
 Once your PR is open, you can ask for review by a maintainer of your platform. Winit's merging policy
 is that a PR must be approved by at least two maintainers of winit before being merged, including