ioctl_tty.2: Update the section number of ldattach

ioctl_tty.2: Update the section number of ldattach

The man page for ldattach was added to util-linux(-ng?)
as a part of the section 8, not the section 1.

    commit 1e8d11c459ae93a4d8d7976a8530ae5198206a26
    Author: Tilman Schmidt <tilman@imap.cc>
    Date:   Mon Mar 10 14:20:26 2008 +0100

	ldattach: new command

	Add an ldattach(8) utility program similar to the one in OpenBSD.

	Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>