The only thing I can see is this reference above:
Note: In order to ensure quality of experience it is recommended to have around 25 clients per radio or 50 clients per AP in high-density deployments.
That said, in my opinion if you're looking to do a wifi deployment, you have to do some sort of wifi site survey to determine optimal count and placement. Wall materials, density of seating, type of room (office vs conference room), other wireless devices, etc all play such huge roles when laying out wifi.
The good thing is with the fine grained radio controls and RX-SOP you can always go a little overboard and then tweak things from there.