Say why the family argument in bindings does not reach the slice wrappers

vendor/raylib/raylib.flan

@@ -875,7 +875,17 @@
 ;; hole exactly where the next caller looks, which is the argument this file
 ;; already makes about ConfigFlags, and the eleven are one family — there is
 ;; no line to draw between DrawSplineLinear and DrawSplineBasis that a reader
-;; would predict. They sit together here rather than each in its own section
+;; would predict.
+;;
+;; `bindings` makes the opposite argument a few lines above its own list —
+;; that hand-writing the variants of a family "would widen the half that has
+;; to be maintained by hand for nothing the examples ask for" — and it is
+;; right there and does not reach here. That paragraph is about hand-written
+;; `declare-c` lines, which are exactly the half a header change can falsify.
+;; None of these eleven is one: each is a `name` directive, so the generated
+;; declaration keeps the C symbol and its checked signature and gives up only
+;; its Flan name. The hand-maintained half does not widen at all — what is
+;; written below is Flan calling Flan, and it cannot disagree with raylib. They sit together here rather than each in its own section
 ;; for the same reason: the justification above is one argument about a shape
 ;; that cuts across Shapes, Images and 3D, and splitting the family would
 ;; mean writing it three times or leaving two thirds of it unexplained.