Changed action from flush to clear

default.prf

@@ -434,7 +434,7 @@ ssl-certificate-paths=/etc/apache2:/etc/dovecot:/etc/httpd:/etc/letsencrypt:/etc
 #proxy-port=3128
 
 # Define the group names to link to this system (preferably single words). Default setting: append
-# To flush groups before assignment, add 'action:flush' as last groupname
+# To clear groups before assignment, add 'action:clear' as last groupname
 #system-groups=groupname1,groupname2,groupname3
 
 # Define which compliance standards are audited and reported on. Disable this if not required.