This special is a link where the label is different from the URL
label[url] or {long label}[url]
# File lib/rdoc/markup/to_html.rb, line 108
def handle_special_TIDYLINK(special)
text = special.text
return text unless text =~ /\{(.*?)\}\[(.*?)\]/ or text =~ /(\S+)\[(.*?)\]/
label = $1
url = $2
gen_url url, label
end