qemu-options.hx: Clean up and fix typo for colo-compare

    ``-object colo-compare,id=id,primary_in=chardevid,secondary_in=chardevid,outdev=chardevid,iothread=id[,vnet_hdr_support][,notify_dev=id][,compare_timeout=@var{ms}][,expired_scan_cycle=@var{ms}][,max_queue_size=@var{size}]``

        Colo-compare gets packet from primary\_in chardevid and

        secondary\_inchardevid, than compare primary packet with

        secondary packet. If the packets are same, we will output

        primary packet to outdevchardevid, else we will notify

        colo-frame do checkpoint and send primary packet to

        outdevchardevid. In order to improve efficiency, we need to put

        the task of comparison in another thread. If it has the

        vnet\_hdr\_support flag, colo compare will send/recv packet with

        vnet\_hdr\_len. Then compare\_timeout=@var{ms} determines the

        maximum delay colo-compare wait for the packet.

        The expired\_scan\_cycle=@var{ms} to set the period of scanning

        expired primary node network packets. The max\_queue\_size=@var{size}

        is to set the max compare queue size depend on user environment.

        If you want to use Xen COLO, will need the notify\_dev to

        secondary\_in, then compare whether the payload of primary packet

        and secondary packet are the same. If same, it will output

        primary packet to out\_dev, else it will notify COLO-framework to do

        checkpoint and send primary packet to out\_dev. In order to

        improve efficiency, we need to put the task of comparison in

        another iothread. If it has the vnet\_hdr\_support flag,

        colo compare will send/recv packet with vnet\_hdr\_len.

        The compare\_timeout=@var{ms} determines the maximum time of the

        colo-compare hold the packet. The expired\_scan\_cycle=@var{ms}

        is to set the period of scanning expired primary node network packets.

        The max\_queue\_size=@var{size} is to set the max compare queue

        size depend on user environment.

        If user want to use Xen COLO, need to add the notify\_dev to

        notify Xen colo-frame to do checkpoint.

        we must use it with the help of filter-mirror and

        filter-redirector.

        COLO-compare must be used with the help of filter-mirror,

        filter-redirector and filter-rewriter.

        ::