Ruby: add missing example rails action

Author: alexrford

ruby/ql/test/query-tests/security/cwe-352/railsapp/app/controllers/articles_controller.rb

@@ -9,6 +9,11 @@ def delete_authored_article
     article.destroy
   end
 
+  def change_title
+    article.title = params[:article_title]
+    article.save!
+  end
+
   def article
     @article ||= Article.find(params[:article_id])
   end