docs: fix range_submit hypercall buffer indexes

[Wenzel]

reported by @Gehim12
related #229

Implementation in QEMU:
https://github.com/IntelLabs/kafl.qemu/blob/kafl_stable/nyx/hypercall/hypercall.c#L296

    if (buffer[0] != 0 && buffer[1] != 0) {
        GET_GLOBAL_STATE()->pt_ip_filter_a[buffer[2]]          = buffer[0];
        GET_GLOBAL_STATE()->pt_ip_filter_b[buffer[2]]          = buffer[1];
        GET_GLOBAL_STATE()->pt_ip_filter_configured[buffer[2]] = true;
        nyx_debug_p(CORE_PREFIX, "Configured range register IP%ld: 0x%08lx-0x%08lx\n",
                    buffer[2], buffer[0], buffer[1]);