Index of new symbols in 2.8

<title>H</title> <indexentry><primaryie>rsvg_handle_get_base_uri, function in RsvgHandle</primaryie></indexentry> <indexentry><primaryie>rsvg_handle_set_dpi, function in RsvgHandle</primaryie></indexentry> <indexentry><primaryie>rsvg_handle_set_dpi_x_y, function in RsvgHandle</primaryie></indexentry> <title>S</title> <indexentry><primaryie>rsvg_set_default_dpi, function in RsvgHandle</primaryie></indexentry> <indexentry><primaryie>rsvg_set_default_dpi_x_y, function in RsvgHandle</primaryie></indexentry>