/usr/share/doc/ruby-graphviz/examples/sample70.rb is in ruby-graphviz 1.2.3-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | $:.unshift( "../lib" )
require 'graphviz'
puts GraphViz.graph( :G ) { |g|
g[:label] = "<<b>This</b> is <i>a</i> <b>test</b>>"
n1 = g.add_nodes( "N1", :label => '<<b>node 1</b>>')
n2 = g.add_nodes( "N2", :label => '<<b>node 2</b>>')
g.add_edges( n1, n2, :label => '<<u>edge</u>>')
}.output( :svg => "#{$0}.svg", :none => String )
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