Merge "Hyperlink is expired"

README.rst

@@ -32,7 +32,7 @@ Quickstart <http://docs.openstack.org/developer/kolla/quickstart.html>`__.
 Docker images
 =============
 
-The `Docker images <https://docs.docker.com/userguide/dockerimages/>`__
+The `Docker images <https://docs.docker.com/engine/tutorials/dockerimages/>`__
 are built by the Kolla project maintainers. A detailed process for
 contributing to the images can be found in the `image building
 guide <http://docs.openstack.org/developer/kolla/image-building.html>`__.