Template:Checks for unknown parameters/doc

This template is for use in the documentation of templates which use Module:Check for unknown parameters.

It is recommended to place it somewhere after the documentation of known parameters, possibly under a heading.

Usage
produces:

There are two optional parameters  and.

should be set if  in the template code sets   to anything.

should be set if  has a category called categoryname in.

For example, Template:Infobox dog breed says:

produces:

The number in parentheses is the number of pages in the category (sometimes inaccurate due to MediaWiki limitations).

There are no options to specify that a preview warning is not set or a tracking category is not added since this could easily be temporary or wrong. The message is both intended for users and maintainers of the template.