The doc screenshot is outdated, probably the parameters H Frames
and V Frames
is what you are looking for. Not sure at which rate frames get picked but it certainly look like a spritesheet-based animation parameter.
Edit: I just gave it a try and that's what I thought. Make your animation as a spritesheet (just a texture, no need for a special node), then set how many frames it has horizontally and vertically. Particles will play each frame one after another during their lifetime, until the end.