DOCS: Document logging out of CILogon

docs/howto/configure/auth-management.md

@@ -193,6 +193,11 @@ To enable CILogon authentication:
   Don't forget to allow login to the test user (`deployment-service-check`), otherwise the hub health check performed during deployment will fail.
   ```
 
+```{note}
+If a user wishes to change which account they login with, they will need to go to the [CILogon's logout page](https://cilogon/logout) before using the same CILogon Identity Provider with another account.
+
+However, if another Indentity Provider is to be used, then the extra logout step is no longer required.
+```
 
 ### Example config for CILogon