nixos/nvidia: update description of BusIds for caveats

      prime.nvidiaBusId = lib.mkOption {

        type = busIDType;

        default = "";

        example = "PCI:1:0:0";

        example = "PCI:1@0:0:0";

        description = ''

          Bus ID of the NVIDIA GPU. You can find it using lspci; for example if lspci

          shows the NVIDIA GPU at "01:00.0", set this option to "PCI:1:0:0".

          shows the NVIDIA GPU at "0001:02:03.4", set this option to "PCI:2@1:3:4".

          lspci might omit the PCI domain (0001 in above example) if it is zero.

          In which case, use "@0" instead.

          Please be aware that this option takes decimal address while lspci reports

          hexadecimal address. So for device at domain "10000", use "@65536".

        '';

      };

      prime.intelBusId = lib.mkOption {

        type = busIDType;

        default = "";

        example = "PCI:0:2:0";

        example = "PCI:0@0:2:0";

        description = ''

          Bus ID of the Intel GPU. You can find it using lspci; for example if lspci

          shows the Intel GPU at "00:02.0", set this option to "PCI:0:2:0".

          shows the Intel GPU at "0001:02:03.4", set this option to "PCI:2@1:3:4".

          lspci might omit the PCI domain (0001 in above example) if it is zero.

          In which case, use "@0" instead.

          Please be aware that this option takes decimal address while lspci reports

          hexadecimal address. So for device at domain "10000", use "@65536".

        '';

      };

      prime.amdgpuBusId = lib.mkOption {

        type = busIDType;

        default = "";

        example = "PCI:4:0:0";

        example = "PCI:4@0:0:0";

        description = ''

          Bus ID of the AMD APU. You can find it using lspci; for example if lspci

          shows the AMD APU at "04:00.0", set this option to "PCI:4:0:0".

          shows the AMD APU at "0001:02:03.4", set this option to "PCI:2@1:3:4".

          lspci might omit the PCI domain (0001 in above example) if it is zero.

          In which case, use "@0" instead.

          Please be aware that this option takes decimal address while lspci reports

          hexadecimal address. So for device at domain "10000", use "@65536".

        '';

      };