Fix a broken url link in README.rst

https://docs.openstack.org/patrole/latest/framework/rbac_utils.html#role-overriding
is broken, this is to fix it.

Change-Id: I273175e09556135fc9665c9065c25ad0c2d7add1
diff --git a/README.rst b/README.rst
index 6115702..f19bda9 100644
--- a/README.rst
+++ b/README.rst
@@ -168,7 +168,7 @@
 
 #. Log information from tests is captured in ``tempest.log`` under the Tempest
    repository. Some Patrole debugging information is captured in that log
-   related to expected test results and `Role Overriding <https://docs.openstack.org/patrole/latest/framework/rbac_utils.html#role-overriding>`_.
+   related to expected test results and `Role Overriding <https://docs.openstack.org/patrole/latest/test_writing_guide.html#role-overriding>`_.
 
    More detailed RBAC testing log output is emitted to ``patrole.log`` under
    the Patrole repository. To configure Patrole's logging, see the