Changed description of new_page rake task, to what it does

Rakefile

@@ -76,7 +76,7 @@ task :new_post, :title do |t, args|
 end
 
 # usage rake new_page[my-new-page] or rake new_page[my-new-page.html] or rake new_page (defaults to "new-page.markdown")
-desc "Begin a new post in #{source_dir}/#{posts_dir}"
+desc "Create a new page in #{source_dir}/(filename)/index.#{new_page_ext}"
 task :new_page, :filename do |t, args|
   require './plugins/titlecase.rb'
   args.with_defaults(:filename => 'new-page')