When applied to content, user experience encompasses design, organization, accessibility, and usability. Can your users quickly find the information they need? Is the process of finding and using information pleasant?
For example, if your primary end users are technicians who carry iPad tablets in the field, you should supply content that is easily accessed and viewed on those devices. A highly designed PDF file with hundreds of pages is probably not the way to go. Instead, lightweight, modular HTML with strong search and navigation capabilities is a better choice.
Understanding your audience goes beyond just how you write content—it is also a crucial factor in deciding how you distribute it.
There is an entire community of practice devoted to creating effective web sites. Good user experience needs to be part of your content strategy.