Fixup migrate-incoming text as requested by Eric in:

 http://lists.nongnu.org/archive/html/qemu-devel/2015-03/msg03362.html



Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>