in site/src/site/pages/download.groovy [146:155]
asc : findUrl(type, area, v, 'asc', preferPermalink),
sha256: findUrl(type, area, v, 'sha256', preferPermalink)]
def first = true
br()
span(style: 'font-variant: small-caps', prefix)
extras.each { ext, u ->
if (first) first = false
else yield ' '
a(href: u, ext)
}