Fix indentation

Author: jovial

doc/source/operations/upgrading.rst

@@ -89,8 +89,8 @@ Some things to watch out for:
      SELECT * FROM trust_role WHERE trust_id = '<trust-id>' AND role_id = '<_member_-role-id>';
 * Policies may require the ``reader`` role rather than the non-standardised
   ``observer`` role. The following error was observed in Horizon: ``Policy doesn’t allow os_compute_api:os-simple-tenant-usage:show to be performed``,
-    when the user only had the observer role in the project. It is best to keep the observer role until all projects have the ``enforce_new_defaults``
-    config option set. A one liner is shown below (or update your projects config):
+  when the user only had the observer role in the project. It is best to keep the observer role until all projects have the ``enforce_new_defaults``
+  config option set. A one liner is shown below (or update your projects config):
 
   .. code-block:: console