add alert

packages/app/src/components/Admin/MarkdownSetting/XssForm.jsx

@@ -102,7 +102,9 @@ class XssForm extends React.Component {
                 onChange={() => { adminMarkDownContainer.setState({ xssOption: RehypeSanitizeOption.CUSTOM }) }}
               />
               <label className="custom-control-label w-100" htmlFor="xssOption2">
-                <p className="font-weight-bold">{t('markdown_settings.xss_options.custom_whitelist')}</p>
+                <p className="font-weight-bold">{t('markdown_settings.xss_options.custom_whitelist')}
+                  <span className='text-warning'> (TBD: Currently unavailable)</span>
+                </p>
                 <WhiteListInput customizable />
               </label>
             </div>