Book 3 Listing 39: `plane_origin`, `axis_A`, and `axis_B`

[hollasch]

Discussed in #1255

^{Originally posted by davidfrogley September 7, 2023}
The code in Listing 39 (quad.h) in the override of the random method lists three member fields by, I believe, the wrong name (unless I missed something, which is certainly possible):

• plane_origin should be Q
• axis_A should be u
• axis_B should be v