Patch to fix typo on routes.rb comments

Not a groundbreaking contribution but, on the comments of 'railties/
configs/routes.rb', there was an extra 'the': "...removing the them or
commenting them...". I've replace it with "...removing or commenting
them..."

https://rails.lighthouseapp.com/projects/8994/tickets/2433-fixing-typo-on-routesrb-comments

Thanks,
Paulo