agetty: Fix implementation of option --nonewline. The flag F_NONL was never set.

Signed-off-by: Benjamin Robin <dev@benjarobin.fr>
agetty: Update help usage function

Signed-off-by: Benjamin Robin <dev@benjarobin.fr>
agetty: update man page

Signed-off-by: Karel Zak <kzak@redhat.com>
mount: fix tiny typo in man page

adjust command to use /dev/loop3 as described in text

Signed-off-by: Stephan Mueller <fruktopus@gmail.com>