PAX SEGVGUARD: fix typo

Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>
PAX SEGVGUARD: reword sysctl description

Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>
PAX ASLR: reword sysctl description

Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>