update github URLs in documentation

Some puppet modules have been renamed in openstack-ci-puppet:

* `jenkins_slave` puppet module has been integrated in `jenkins` module
* `openstack-ci-config` has been renamed `openstack_project`

Change-Id: Ie4a35022301c156f74e1fdef859c87319efb60da
Reviewed-on: https://review.openstack.org/13519
Approved: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Tested-by: Jenkins
diff --git a/doc/source/zuul.rst b/doc/source/zuul.rst
index 8d7bbef..b1df201 100644
--- a/doc/source/zuul.rst
+++ b/doc/source/zuul.rst
@@ -344,7 +344,7 @@
 project-pyflakes are only executed if project-merge succeeds.  This
 can help avoid running unnecessary jobs.
 
-.. seealso:: The OpenStack Zuul configuration for a comprehensive example: https://github.com/openstack/openstack-ci-puppet/blob/master/modules/openstack-ci-config/files/zuul/layout.yaml
+.. seealso:: The OpenStack Zuul configuration for a comprehensive example: https://github.com/openstack/openstack-ci-puppet/blob/master/modules/openstack_project/files/zuul/layout.yaml
 
 
 logging.conf