Added a space before "do" keyword

actionpack/lib/action_view/helpers/form_tag_helper.rb

@@ -39,7 +39,7 @@ module FormTagHelper
       #   form_tag('/upload', :multipart => true)
       #   # => <form action="/upload" method="post" enctype="multipart/form-data">
       #
-      #   <%= form_tag('/posts')do -%>
+      #   <%= form_tag('/posts') do -%>
       #     <div><%= submit_tag 'Save' %></div>
       #   <% end -%>
       #   # => <form action="/posts" method="post"><div><input type="submit" name="submit" value="Save" /></div></form>