MDL-29093 auth - help string changed to VBFET suggestion

(very best favourite english translator, aka. Helen :-P)

lang/en/admin.php

@@ -60,7 +60,7 @@
 $string['aspellpath'] = 'Path to aspell';
 $string['authentication'] = 'Authentication';
 $string['authpreventaccountcreation'] = 'Prevent account creation when authenticating';
-$string['authpreventaccountcreation_help'] = 'When a user authenticates, if they do not yet have an account on the site, usually one will be automatically created for them. It may be that you wish to authenticate using an external system, but you wish to restrict access to the site to users with an existing account only. With this option enabled, only existing users will be able to gain access after they are authenticated via the external system. New accounts will need to be created manually or via the upload users feature.';
+$string['authpreventaccountcreation_help'] = 'When a user authenticates, an account on the site is automatically created if it doesn\'t yet exist. If an external database, such as LDAP, is used for authentication, but you wish to restrict access to the site to users with an existing account only, then this option should be enabled. New accounts will need to be created manually or via the upload users feature.';
 $string['authsettings'] = 'Manage authentication';
 $string['autolang'] = 'Language autodetect';
 $string['autologinguests'] = 'Auto-login guests';