/usr/share/gtk-doc/html/ is in libctpl-doc 0.3.3.dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/ctpl/
/usr/share/gtk-doc/html/ctpl/annotation-glossary.html
/usr/share/gtk-doc/html/ctpl/api-index-deprecated.html
/usr/share/gtk-doc/html/ctpl/api-index-full.html
/usr/share/gtk-doc/html/ctpl/ch01.html
/usr/share/gtk-doc/html/ctpl/ch01s02.html
/usr/share/gtk-doc/html/ctpl/ch01s03.html
/usr/share/gtk-doc/html/ctpl/ch01s05.html
/usr/share/gtk-doc/html/ctpl/ch02.html
/usr/share/gtk-doc/html/ctpl/ctpl-CtplEnviron.html
/usr/share/gtk-doc/html/ctpl/ctpl-CtplEval.html
/usr/share/gtk-doc/html/ctpl/ctpl-CtplInputStream.html
/usr/share/gtk-doc/html/ctpl/ctpl-CtplLexer.html
/usr/share/gtk-doc/html/ctpl/ctpl-CtplLexerExpr.html
/usr/share/gtk-doc/html/ctpl/ctpl-CtplOutputStream.html
/usr/share/gtk-doc/html/ctpl/ctpl-CtplParser.html
/usr/share/gtk-doc/html/ctpl/ctpl-CtplToken.html
/usr/share/gtk-doc/html/ctpl/ctpl-CtplValue.html
/usr/share/gtk-doc/html/ctpl/ctpl-Generic-IO.html
/usr/share/gtk-doc/html/ctpl/ctpl-Version-information.html
/usr/share/gtk-doc/html/ctpl/ctpl.devhelp
/usr/share/gtk-doc/html/ctpl/ctpl.devhelp2
/usr/share/gtk-doc/html/ctpl/environment-description-syntax.html
/usr/share/gtk-doc/html/ctpl/home.png
/usr/share/gtk-doc/html/ctpl/index.html
/usr/share/gtk-doc/html/ctpl/index.sgml
/usr/share/gtk-doc/html/ctpl/left.png
/usr/share/gtk-doc/html/ctpl/right.png
/usr/share/gtk-doc/html/ctpl/style.css
/usr/share/gtk-doc/html/ctpl/up.png