This link has been broken since at least Ruby 3.0.
The OptionParser#on method documentation has a broken link for the text Parameters for New Options.
The desired target document is here: https://ruby-doc.org/3.4.1/optparse/option_params_rdoc.html
The broken link should be corrected.
Also, the sample program for https://ruby-doc.org/3.4.1/optparse/option_params_rdoc.html#label-Simple+Long+Names has code that needs to be encapsulated within <pre></pre>.