/usr/share/doc/ is in php-sabre-dav 1.8.12-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/php-sabre-dav/
/usr/share/doc/php-sabre-dav/examples/
/usr/share/doc/php-sabre-dav/examples/simplefsserver.php
/usr/share/doc/php-sabre-dav/examples/fileserver.php
/usr/share/doc/php-sabre-dav/examples/addressbookserver.php
/usr/share/doc/php-sabre-dav/examples/calendarserver.php
/usr/share/doc/php-sabre-dav/examples/sql/
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/usr/share/doc/php-sabre-dav/examples/sql/pgsql.principals.sql
/usr/share/doc/php-sabre-dav/examples/sql/pgsql.locks.sql
/usr/share/doc/php-sabre-dav/examples/sql/mysql.users.sql
/usr/share/doc/php-sabre-dav/examples/sql/mysql.principals.sql
/usr/share/doc/php-sabre-dav/examples/sql/pgsql.users.sql
/usr/share/doc/php-sabre-dav/examples/sql/sqlite.calendars.sql
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/usr/share/doc/php-sabre-dav/examples/sql/sqlite.principals.sql
/usr/share/doc/php-sabre-dav/examples/sql/pgsql.calendars.sql
/usr/share/doc/php-sabre-dav/examples/sql/sqlite.users.sql
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/usr/share/doc/php-sabre-dav/examples/groupwareserver.php
/usr/share/doc/php-sabre-dav/examples/digestauth.php
/usr/share/doc/php-sabre-dav/examples/webserver/
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/usr/share/doc/php-sabre-dav/copyright
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/usr/share/doc/php-sabre-dav/README.Debian