Fix paths in contribution guideline

Author: Dagefoerde

CONTRIBUTING.md

@@ -27,4 +27,4 @@ Ways to improve your chances of getting your contribution accepted:
 * Only one pull request per feature or fix.
 * Send coherent history by making sure each individual commit in your pull request is meaningful. Use interactive
   rebase to squash intermediate commits.
-* Ensure that [read me](README.md), [change log](CHANGELOG.md) and [other docs](doc) are updated as needed.
+* Ensure that [read me](README.md), [change log](docs/CHANGELOG.md) and [other docs](docs/) are updated as needed.