Improve help line for restricted domain signups

app/views/admin/application_settings/_form.html.haml

@@ -76,7 +76,7 @@
       = f.label :restricted_signup_domains, 'Restricted domains for sign-ups', class: 'control-label col-sm-2'
       .col-sm-10
         = f.text_area :restricted_signup_domains_raw, placeholder: 'domain.com', class: 'form-control'
-        .help-block Ex: domain.com, *.domain.com. Wildcards allowed. Use separate lines for multiple entries.
+        .help-block Only users with e-mail addresses that match these domain(s) will be able to sign-up. Wildcards allowed. Use separate lines for multiple entries. Ex: domain.com, *.domain.com
 
   .form-actions
     = f.submit 'Save', class: 'btn btn-primary'