/usr/share/gtk-doc/ is in libsecret-1-dev 0.18.4-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/
/usr/share/gtk-doc/html/libsecret-1/
/usr/share/gtk-doc/html/libsecret-1/SecretCollection.html
/usr/share/gtk-doc/html/libsecret-1/SecretItem.html
/usr/share/gtk-doc/html/libsecret-1/SecretPrompt.html
/usr/share/gtk-doc/html/libsecret-1/SecretService.html
/usr/share/gtk-doc/html/libsecret-1/SecretValue.html
/usr/share/gtk-doc/html/libsecret-1/annotation-glossary.html
/usr/share/gtk-doc/html/libsecret-1/c-examples.html
/usr/share/gtk-doc/html/libsecret-1/c-lookup-example.html
/usr/share/gtk-doc/html/libsecret-1/c-remove-example.html
/usr/share/gtk-doc/html/libsecret-1/c-store-example.html
/usr/share/gtk-doc/html/libsecret-1/complete.html
/usr/share/gtk-doc/html/libsecret-1/examples.html
/usr/share/gtk-doc/html/libsecret-1/home.png
/usr/share/gtk-doc/html/libsecret-1/index.html
/usr/share/gtk-doc/html/libsecret-1/index.sgml
/usr/share/gtk-doc/html/libsecret-1/js-examples.html
/usr/share/gtk-doc/html/libsecret-1/js-lookup-example.html
/usr/share/gtk-doc/html/libsecret-1/js-remove-example.html
/usr/share/gtk-doc/html/libsecret-1/js-store-example.html
/usr/share/gtk-doc/html/libsecret-1/left-insensitive.png
/usr/share/gtk-doc/html/libsecret-1/left.png
/usr/share/gtk-doc/html/libsecret-1/libsecret-1.devhelp2
/usr/share/gtk-doc/html/libsecret-1/libsecret-DBus-Path-Related-Functions.html
/usr/share/gtk-doc/html/libsecret-1/libsecret-Password-storage.html
/usr/share/gtk-doc/html/libsecret-1/libsecret-Secret-Attributes.html
/usr/share/gtk-doc/html/libsecret-1/libsecret-SecretError.html
/usr/share/gtk-doc/html/libsecret-1/libsecret-SecretSchema.html
/usr/share/gtk-doc/html/libsecret-1/migrating-api.html
/usr/share/gtk-doc/html/libsecret-1/migrating-introduction.html
/usr/share/gtk-doc/html/libsecret-1/migrating-items.html
/usr/share/gtk-doc/html/libsecret-1/migrating-keyrings.html
/usr/share/gtk-doc/html/libsecret-1/migrating-locking.html
/usr/share/gtk-doc/html/libsecret-1/migrating-memory.html
/usr/share/gtk-doc/html/libsecret-1/migrating-misc.html
/usr/share/gtk-doc/html/libsecret-1/migrating-removing.html
/usr/share/gtk-doc/html/libsecret-1/migrating-schemas.html
/usr/share/gtk-doc/html/libsecret-1/migrating-searching.html
/usr/share/gtk-doc/html/libsecret-1/migrating-storing.html
/usr/share/gtk-doc/html/libsecret-1/migrating.html
/usr/share/gtk-doc/html/libsecret-1/py-examples.html
/usr/share/gtk-doc/html/libsecret-1/py-lookup-example.html
/usr/share/gtk-doc/html/libsecret-1/py-remove-example.html
/usr/share/gtk-doc/html/libsecret-1/py-store-example.html
/usr/share/gtk-doc/html/libsecret-1/right-insensitive.png
/usr/share/gtk-doc/html/libsecret-1/right.png
/usr/share/gtk-doc/html/libsecret-1/simple.html
/usr/share/gtk-doc/html/libsecret-1/style.css
/usr/share/gtk-doc/html/libsecret-1/up-insensitive.png
/usr/share/gtk-doc/html/libsecret-1/up.png
/usr/share/gtk-doc/html/libsecret-1/using-c.html
/usr/share/gtk-doc/html/libsecret-1/using-js.html
/usr/share/gtk-doc/html/libsecret-1/using-python.html
/usr/share/gtk-doc/html/libsecret-1/using-vala.html
/usr/share/gtk-doc/html/libsecret-1/using.html
/usr/share/gtk-doc/html/libsecret-1/vala-examples.html
/usr/share/gtk-doc/html/libsecret-1/vala-lookup-example.html
/usr/share/gtk-doc/html/libsecret-1/vala-remove-example.html
/usr/share/gtk-doc/html/libsecret-1/vala-store-example.html