A documentation template is set of a pages with a predefined structure and content, that can be used as an initial base when creating new documentation spaces.
Create a documentation template
To create a new documentation template, select the Create New... menu item from the Documentation menu in the left hand upper corner, and choose Documentation Template from the according dialog:
And enter the required details, and create the template.
Add pages and content to the template
Once you've created the template, you can add pages and content just like working in a normal Documentation Space.