accept.2, dup.2, eventfd.2, execve.2, fcntl.2, memfd_create.2, open.2, perf_event_ope...

accept.2, dup.2, eventfd.2, execve.2, fcntl.2, memfd_create.2, open.2, perf_event_open.2, pipe.2, signalfd.2, socket.2, socketpair.2, spu_create.2, timerfd_create.2, getgrent.3, getgrnam.3, getlogin.3, getpwent.3, getpwnam.3, mq_open.3, opendir.3, sem_open.3, shm_open.3, tmpfile.3: ERRORS: standardize text for EMFILE error

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>