Format the setting's description into HTML.

def format_help(self, description):
        """
        Format the setting's description into HTML.
        """
        for bold in ("``", "*"):
            parts = []
            if description is None:
                description = ""
            for i, s in enumerate(description.split(bold)):
                parts.append(s if i % 2 == 0 else "<b>%s</b>" % s)
            description = "".join(parts)
        description = urlize(description, autoescape=False)
        return mark_safe(description.replace("\n", "<br>"))