add icons for official bot description

src/client/js/components/Admin/SlackIntegration/SlackIntegration.jsx

@@ -135,12 +135,16 @@ const SlackIntegration = (props) => {
                 <div className="mt-4">
                   <div className="mb-2">
                     {t('admin:slack_integration.selecting_bot_types.set_up_to_take_time')}
+                    <i className="fa fa-circle-o fa-lg" aria-hidden="true"></i>
                   </div>
                   <div className="mb-2">
                     {t('admin:slack_integration.selecting_bot_types.integration_to_multi_workspaces')}
+                    <i className="fa fa-circle-o fa-lg" aria-hidden="true"></i>
                   </div>
                   <div className="mb-2">
                     {t('admin:slack_integration.selecting_bot_types.security_control')}
+                    <i className="fa fa-times fa-2x" aria-hidden="true"></i>
+
                   </div>
                 </div>
               </p>