kexec-kdump-howto: Add doc about the special mount information via "dracut_args"
Update "kexec-kdump-howto" to illustrate the usage of special mount
information via "dracut_args".
Reviewed-by: Pratyush Anand <panand@redhat.com>
Suggested-by: Dave Young <dyoung@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Xunlei Pang <xlpang@redhat.com>