I think they are saying use a resistive divider to step down each 5V output to 3V.
So a resistor pack wired up to make a bunch of resisitive dividers, or a resistor pack where it's alreayd like that internally.
Not the way I would do it, but it's a cheap, quick and dirty way to do it, as long as the loads don't draw too much current from the PIC outputs.
You can also use 5-3V logic level translation ICs to do the job which can be better as power consumption is concerned especially if the load likes to draw more current from the PIC pins.