It depends. As a reseller, you’re in charge of offering support to your web hosting customers. To reduce support queries, having proper documentation is worth its weight in gold. Although your hosting providers may have extensive documentation published on their site, you can’t refer your customers to them because your service is white labeled.
A reputed hosting provider should also offer you white labeled tutorial videos to help your customers in need. Once you’ve rebranded the content, you can refer your customers to those videos.