Docstring for perspective-matrix declares "fovy" is in degrees, but actually is in radians

[andregrigon]

The documentation for perspective-matrix says

FOVY is the field of view, in degrees.

But the code actually assumes it is in radians.

(By the way, thanks for the code!)

[DreamAndDead]

mathkit/src/math.lisp

Line 63 in fd884f9

FOVY is the field of view, in degrees.

-> field of view, in radians.