blktrace: remove -k from manpage synopsis

An earlier commit:

  fb7f8667 blktrace: disable kill option - take 2

removed the "-k" option documentation, but left
it in the synopsis.

This is a bit unusual and unhelpful and probably
unintended; remove it from the synopsis as well.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
1 file changed