This template displays a "Template documentation" box like you are seeing now.

It is primarily used by

{{template doc}} to automatically display the documentation for the template from a /doc subpage, but can also be used to display inline documentation.

{{template doc inline|1=inline documentation|2=pagename}}

  • Inline documentation is the text to display inside the box.
  • Pagename refers to the name of the documentation page, which if specified, creates [view] and [edit] boxes to the right of the heading.