remove line about logging out because !221 is merged

docs/installation_instructions.md

@@ -333,8 +333,7 @@ These applications should be available after the installation is completed:
 
 - Single sign-on is still in an experimental phase. We are still working on
   transferring "roles" from users in the central database to applications, so
-  your SSO's admin user gets admin permissions in all the applications. Some
-  applications do not support logging out, currently.
+  your SSO's admin user gets admin permissions in all the applications.
 - Nextcloud does not send emails yet. You can configure sending emails by going
   to Settings -> Basic settings -> Email server and entering SMTP email
   credentials.