Fix nesting in the external auth settings form

ee/app/views/admin/application_settings/_external_authorization_service_form.html.haml

@@ -13,10 +13,10 @@
           = link_to icon('question-circle'), help_page_path('user/admin_area/settings/external_authorization')
     .form-group
       = f.label :external_authorization_service_url, _('Service URL'), class: 'control-label col-sm-2'
-      %span.help-block
-        = external_authorization_url_help_text
       .col-sm-10
         = f.text_field :external_authorization_service_url, class: 'form-control'
+        %span.help-block
+          = external_authorization_url_help_text
     .form-group
       = f.label :external_authorization_service_timeout, _('External authorization request timeout'), class: 'control-label col-sm-2'
       .col-sm-10