[Firmware] Comment about RGB and RGBW not able to be mixed in same chian is no longer accurate

[ChaosBlades]

Note: RGB and RGBW are different and must be defined explicitly. RGB and RGBW are also not able to be mix-and-matched in the same chain. A separate data line would be needed for proper functioning.

Support for this was aded for the Rainbow Barf mod
https://github.com/tanaes/whopping_Voron_mods/tree/main/LEDs/Rainbow_Barf_Logo_LED
Here is the pull request
Klipper3d/klipper#5409