Fix typo in nginx.md
Fix typo in nginx.md
dokku/dokku,dokku/dokku,progrium/dokku,claytonbrown/dokku,claytonbrown/dokku,dokku/dokku,claytonbrown/dokku,dokku/dokku,claytonbrown/dokku,progrium/dokku,progrium/dokku,dokku/dokku,progrium/dokku,dokku/dokku,claytonbrown/dokku,dokku/dokku,claytonbrown/dokku,progrium/dokku,progrium/dokku,claytonbrown/dokku,progrium/dokku,progrium/dokku,claytonbrown/dokku,dokku/dokku