Template:Documentation subpage/doc

Usage
documentation subpage OR main page to link to

This template should be placed at the top of "/doc" pages. It changes output depending on where it is viewed:
 * On a "/doc" page, it displays a box explaining template documentation and links to the template page.
 * On other pages (ie, pages transcluding the "/doc" page), it notes that the documentation is transcluded from a subpage.