allow the probabilistic recipe output of the reprocessing plant to yield more than 1 item of a type per cycle

src/lib/sim/BuildingBuffers.h

@@ -13,9 +13,9 @@
 // to BeltSystem. Free functions over the config and the building — they read no
 // factory state, so both BuildingSystem and ConstructionSystem can use them.
 
-// Buffers for a building running one known recipe: inputs capped at twice each
-// ingredient's per-cycle amount, output at twice the per-cycle total (one cycle's
-// max for a Reprocessing Plant, REQ-MAT-OUTPUT-BUFFER-REPROCESSING).
+// Buffers for a building running one known recipe: one buffer per material on each
+// side, capped at twice that material's per-cycle amount (REQ-MAT-INPUT-BUFFER,
+// REQ-MAT-OUTPUT-BUFFER).
 void initBuffers(Building& b, const RecipeDef& recipe);
 
 // Buffers for an auto-recipe building (Smelter, Reprocessing Plant), unioned over