/usr/share/doc/ is in ruby-glib2 3.1.0-1+deb9u1.
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/usr/share/doc/ruby-glib2/
/usr/share/doc/ruby-glib2/changelog.Debian.gz
/usr/share/doc/ruby-glib2/copyright
/usr/share/doc/ruby-glib2/examples/
/usr/share/doc/ruby-glib2/examples/bookmarkfile.rb
/usr/share/doc/ruby-glib2/examples/idle.rb
/usr/share/doc/ruby-glib2/examples/iochannel.rb
/usr/share/doc/ruby-glib2/examples/keyfile.rb
/usr/share/doc/ruby-glib2/examples/shell.rb
/usr/share/doc/ruby-glib2/examples/spawn.rb
/usr/share/doc/ruby-glib2/examples/timeout.rb
/usr/share/doc/ruby-glib2/examples/timeout2.rb
/usr/share/doc/ruby-glib2/examples/timer.rb
/usr/share/doc/ruby-glib2/examples/type-register.rb
/usr/share/doc/ruby-glib2/examples/type-register2.rb
/usr/share/doc/ruby-glib2/examples/utils.rb