/usr/share/doc/ruby-erubis/doc-api/classes/Erubis/PI/ is in ruby-erubis 2.7.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/ruby-erubis/doc-api/classes/Erubis/PI/Converter.html
/usr/share/doc/ruby-erubis/doc-api/classes/Erubis/PI/Ec.html
/usr/share/doc/ruby-erubis/doc-api/classes/Erubis/PI/Ecpp.html
/usr/share/doc/ruby-erubis/doc-api/classes/Erubis/PI/Ejava.html
/usr/share/doc/ruby-erubis/doc-api/classes/Erubis/PI/Ejavascript.html
/usr/share/doc/ruby-erubis/doc-api/classes/Erubis/PI/Engine.html
/usr/share/doc/ruby-erubis/doc-api/classes/Erubis/PI/Eperl.html
/usr/share/doc/ruby-erubis/doc-api/classes/Erubis/PI/Ephp.html
/usr/share/doc/ruby-erubis/doc-api/classes/Erubis/PI/Eruby.html
/usr/share/doc/ruby-erubis/doc-api/classes/Erubis/PI/Escheme.html
/usr/share/doc/ruby-erubis/doc-api/classes/Erubis/PI/TinyEruby.html