Fixed #11883: Documented how to set a custom template name on a flatpage.

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By default, flatpages are rendered via the template

:file:`flatpages/default.html`, but you can override that for a particular

flatpage.

:file:`flatpages/default.html`, but you can override that for a

particular flatpage: in the admin, a collapsed fieldset titled

"Advanced options" (clicking will expand it) contains a field for

specifying a template name. If you're creating a flat page via the

Python API you can simply set the template name as the field

``template_name`` on the ``FlatPage`` object.

Creating the :file:`flatpages/default.html` template is your responsibility;

in your template directory, just create a :file:`flatpages` directory