From Fedora Project Wiki
Template:Tempdoc provides a convenient way to include documentation for a template. This template is the preferred way to insert this sort of information.
To use this template, insert <noinclude>{{tempdoc}}</noinclude> at the end of the template. The <noinclude></noinclude> tags may be omitted if the template has already been wrapped with <onlyinclude></onlyinclude> tags.
Template:For and Template:Delete demonstrate this template in action.