drivers/ws281x: fix documentation
drivers/ws281x: fix documentation

extend ws281x documentation with usage for ESP32 and VT100

fix indendation

kaspar030/RIOT,yogo1212/RIOT,authmillenon/RIOT,authmillenon/RIOT,kYc0o/RIOT,OTAkeys/RIOT,ant9000/RIOT,kYc0o/RIOT,jasonatran/RIOT,authmillenon/RIOT,miri64/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,miri64/RIOT,yogo1212/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,miri64/RIOT,jasonatran/RIOT,OTAkeys/RIOT,kaspar030/RIOT,OlegHahm/RIOT,miri64/RIOT,kaspar030/RIOT,OlegHahm/RIOT,jasonatran/RIOT,jasonatran/RIOT,yogo1212/RIOT,basilfx/RIOT,RIOT-OS/RIOT,basilfx/RIOT,kYc0o/RIOT,authmillenon/RIOT,jasonatran/RIOT,authmillenon/RIOT,basilfx/RIOT,OlegHahm/RIOT,yogo1212/RIOT,ant9000/RIOT,OTAkeys/RIOT,kaspar030/RIOT,ant9000/RIOT,kYc0o/RIOT,ant9000/RIOT,miri64/RIOT,basilfx/RIOT,yogo1212/RIOT,OTAkeys/RIOT,kYc0o/RIOT,ant9000/RIOT,OlegHahm/RIOT,authmillenon/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,basilfx/RIOT