Fonts spec template notes/font pkg

The %_font_pkg macro takes the following arguments:
 * an optional -n name subpackage name
 * an optional -f pattern fontconfig pattern name. The corresponding files must be installed by the packager in %{_fontconfig_templatedir} and %{_fontconfig_confdir} in the %install section.
 * a list of font names or font name patterns. The corresponding files must be installed by the packager in %{_fontdir} in the %install section.