/usr/share/man/man3/seccomp_arch_remove.3.gz is in libseccomp-dev 2.1.1-1ubuntu1~trusty5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/seccomp_arch_add.3.gz
/usr/share/man/man3/seccomp_arch_add.3.gz