Updated Intro-to-Rails example images to show current version of Safari

Author: jeremyjung

sites/en/intro-to-rails/CRUD_with_scaffolding.step

@@ -23,7 +23,7 @@ steps {
 
   step {
     message "Point your browser to [http://localhost:3000/topics](http://localhost:3000/topics)"
-    message "You should see the \"Listing topics\" page with headers for title and description, and a link to add a new topic:"
+    message "You should see the \"Topics\" page with headers for title and description, and a link to add a new topic:"
 
     img src: "img/Seattle_topic_list_page.png", alt: "Screenshot of topic list page"
   }