Updating the Prim Ref page

[Travis Cobbs]

4-4 chrd would be 7 quads (14 triangles) instead of 16 triangles...
maybe less code and less render work...

IMO, the way that any given flat primitive is meshed is not intrinsic to the primitive definition. In other words, 4-4disc could internally be created with 14 quads and still be a perfectly valid 4-4disc. Note: I'm not suggesting it be updated, just that the way that it is meshed is an implementation detail.