Recommend --no-document instead of --no-ri --no-rdoc

Author: tjgrathwell

sites/en/installfest/windows.step

@@ -100,7 +100,7 @@ end
 step "Update Rails" do
   message "Currently, RailsInstaller installs Rails 4.1.x, but we want the latest. Upgrading Rails is pretty easy:"
 
-  console "gem install rails --no-ri --no-rdoc"
+  console "gem install rails --no-document"
 
   message "...and you're done. New Rails! Woo."
 end