Update the documention for doc migration

Change-Id: Ie6d322d1b9c93118af7c74986993010b9f4b76b2
diff --git a/doc/source/test_removal.rst b/doc/source/test_removal.rst
index d06e4ba..07c3046 100644
--- a/doc/source/test_removal.rst
+++ b/doc/source/test_removal.rst
@@ -171,7 +171,7 @@
 `tempest plugin mechanism`_
 to maintain continuity after migrating the tests out of tempest.
 
-.. _tempest plugin mechanism: http://docs.openstack.org/developer/tempest/plugin.html
+.. _tempest plugin mechanism: https://docs.openstack.org/tempest/latest/plugin.html
 
 API Compatibility
 """""""""""""""""