pldd.1, bpf.2, execve.2, futex.2, ioctl_fat.2, ioctl_tty.2, keyctl.2, signalfd.2...

pldd.1, bpf.2, execve.2, futex.2, ioctl_fat.2, ioctl_tty.2, keyctl.2, signalfd.2, timerfd_create.2, __ppc_get_timebase.3, a64l.3, frexp.3, pthread_setname_np.3, regex.3, rpmatch.3, scanf.3, strfmon.3, strftime.3, termios.3, console_codes.4, vcs.4, veth.4, core.5, dir_colors.5, termcap.5, ascii.7, charsets.7, glob.7, man-pages.7, operator.7, regex.7, user_namespaces.7, zic.8: Use "\(ha" rather than "^" in code

This renders better in PDF.

Reported-by: Geoff Clare <gwc@opengroup.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>