docs: concepts: Fix contact us link

Signed-off-by: John Andersen <[email protected]>

Author: pdxjohnny

docs/concepts/index.rst

@@ -4,7 +4,7 @@ Concepts
 Here we explain the main concepts of DFFML. How things work, and the
 philosophies behind why they work they way they do. If anything here is unclear,
 or you think there's a more user friendly way to do something, please let us
-know. See the :doc:`contact` page for how to reach us.
+know. See the :doc:`/contact` page for how to reach us.
 
 .. toctree::
     :glob: