man*/: epoll_*(), fcntl(), flock(), ioctl(), msgctl(), *prctl(), ptrace(), quotactl...

man*/: epoll_*(), fcntl(), flock(), ioctl(), msgctl(), *prctl(), ptrace(), quotactl(), reboot(), semctl(), shmctl(), lockf(): Consistently use 'op' and 'operation'

Reported-by: Bruno Haible <bruno@clisp.org>
Cc: Elliott Hughes <enh@google.com>
Cc: Stefan Puiu <stefan.puiu@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>