There isn't a real datasheet for this device, although the product
page is here:
https://www.adafruit.com/product/1938
This symbol is meant to be used with the existing footprint
"LEDs:LED_D5.0mm-4", and the pinout is chosen accordingly. I don't
think this symbol can be used for SMT WS2812 LEDs, because I believe
the pinout is different.