/usr/share/man/man1/sieved.1.gz is in dovecot-sieve 1:2.2.22-1ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/sieve-dump.1.gz
/usr/share/man/man1/sieve-dump.1.gz