fix relative link

Author: dojutsu-user

docs/faq.rst

@@ -69,8 +69,7 @@ My project requires different settings than that are available under Admin
 
 Read the Docs offers additional flag settings. To enable these settings, please open an
 request issue on our `github`_ and we will change the settings for the project. Read more about
-these flag settings
-:ref:`here <guides/feature-flags>`.
+these flag settings :doc:`here <guides/feature-flags>`.
 
 .. _github: https://github.com/rtfd/readthedocs.org