Update team_general_tab.jsx

Add more direct instructions on enabling the team directory in the system console. From community issue: https://github.com/mattermost/platform/issues/1835

web/react/components/team_general_tab.jsx

@@ -66,7 +66,7 @@ export default class GeneralTab extends React.Component {
 
     handleTeamListingRadio(listing) {
         if (global.window.mm_config.EnableTeamListing !== 'true' && listing) {
-            this.setState({clientError: 'Team directory has been disabled.  Please ask a system admin to enable it.'});
+            this.setState({clientError: 'Team directory has been disabled.  Please ask a system admin to enable the team directory in the system console team settings.'});
         } else {
             this.setState({allow_team_listing: listing});
         }