PE Middle Layer Tent Kit Updates

[derpmcgerp1080p]

Hello,

I noticed the design for the nut retention on the PE middle layer (Ergodox tent) has switch from a recessed M3 nut(legacy) to a square nut channel. The documentation should be updated to reflect the new requirement of a m3 square nut.

[nooges]

It still uses as hex nut, but we’ve seen that fatter hex nuts are out there.