Hi Eric. To start, check this out – Wi-Fi Mesh Support: Overview and Howto. In particular, note the hardware requirements Travis identifies and that you must be using FW 8.1.1 in the router and 3.6.2/3.7.3/3.8.1 in the AP, as appropriate.
As to your point about “AP hardware page to show mesh …”: This function is brand new – with FW 8.1.1. So far as I am aware, the spec sheets have not been updated to reflect this capability yet (although I’d be pleased to be corrected on this.) I do think @Travis’s guidance is authoritative and should lead you in he right direction.
I’d expect the spec/cut sheets to be updated in time. This is still very “new.”