URL changes are modified to be correct

Change-Id: Ied5ee7da0a37405f130f7cecff48919f16435952
diff --git a/doc/source/configuration.rst b/doc/source/configuration.rst
index d932d8c..919a053 100644
--- a/doc/source/configuration.rst
+++ b/doc/source/configuration.rst
@@ -643,7 +643,7 @@
 Cells
 ~~~~~
 
-`Cells <http://wiki.openstack.org/blueprint-nova-compute-cells>`__ is
+`Cells <https://wiki.openstack.org/wiki/Blueprint-nova-compute-cells>`__ is
 an alternative scaling option.  To setup a cells environment add the
 following to your ``localrc`` section: