removes unnecessary curlies in collection_select rdoc

actionpack/lib/action_view/helpers/form_options_helper.rb

@@ -149,7 +149,7 @@ def select(object, method, choices, options = {}, html_options = {})
       #   end
       #
       # Sample usage (selecting the associated Author for an instance of Post, <tt>@post</tt>):
-      #   collection_select(:post, :author_id, Author.all, :id, :name_with_initial, {:prompt => true})
+      #   collection_select(:post, :author_id, Author.all, :id, :name_with_initial, :prompt => true)
       #
       # If <tt>@post.author_id</tt> is already <tt>1</tt>, this would return:
       #   <select name="post[author_id]">